EP2146866A1 - Messsystem und messverfahren zur erfassung mindestens einer frequenzunabhängigen elektrischen grösse - Google Patents
Messsystem und messverfahren zur erfassung mindestens einer frequenzunabhängigen elektrischen grösseInfo
- Publication number
- EP2146866A1 EP2146866A1 EP08750209A EP08750209A EP2146866A1 EP 2146866 A1 EP2146866 A1 EP 2146866A1 EP 08750209 A EP08750209 A EP 08750209A EP 08750209 A EP08750209 A EP 08750209A EP 2146866 A1 EP2146866 A1 EP 2146866A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- seat
- measuring system
- measuring
- isofix
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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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
- 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
- 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
- B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
- B60N2/0024—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat
- B60N2/0026—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat for distinguishing between humans, animals or objects
-
- 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
- B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
- B60N2/0035—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor data transmission, e.g. wired connections or wireless transmitters therefor; characterised by the sensor data processing, e.g. seat sensor signal amplification or electric circuits for providing seat sensor information
-
- 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
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
- B60N2/266—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children with detection or alerting means responsive to presence or absence of children; with detection or alerting means responsive to improper locking or installation of the child seats or parts thereof
- B60N2/268—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children with detection or alerting means responsive to presence or absence of children; with detection or alerting means responsive to improper locking or installation of the child seats or parts thereof detecting or alerting means responsive to the installation of the child seats in the vehicle
-
- 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
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
- B60N2/266—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children with detection or alerting means responsive to presence or absence of children; with detection or alerting means responsive to improper locking or installation of the child seats or parts thereof
- B60N2/268—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children with detection or alerting means responsive to presence or absence of children; with detection or alerting means responsive to improper locking or installation of the child seats or parts thereof detecting or alerting means responsive to the installation of the child seats in the vehicle
- B60N2/269—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children with detection or alerting means responsive to presence or absence of children; with detection or alerting means responsive to improper locking or installation of the child seats or parts thereof detecting or alerting means responsive to the installation of the child seats in the vehicle detecting or alerting means responsive to the Isofix locking on the child seat or vehicle
-
- 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
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
- B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
- B60N2/2887—Fixation to a transversal anchorage bar, e.g. isofix
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
- B60N2210/10—Field detection presence sensors
- B60N2210/12—Capacitive; Electric field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2230/00—Communication or electronic aspects
- B60N2230/30—Signal processing of sensor data
Definitions
- the invention relates to a measuring system and a measuring method, in particular for a motor vehicle.
- Measuring methods are known from the prior art, which usually rely on the detection of frequency-dependent electrical quantities in order to detect different states.
- voltages, current intensities, charge quantities and capacities or other electrical or electromagnetic variables are regularly measured as a function of an applied frequency in order to be able to make statements about a change in state within a system to be monitored by means of their change or value relative to a reference value or by means of their course ,
- Such measuring methods or measuring systems are usually also used in the field of seat occupancy detection in a motor vehicle.
- US Pat. No. 6,563,231 B1 describes a vehicle occupant sensor whose electric field sensor has a plurality of first electrodes that can be accommodated in a vehicle seat and at least one second electrode.
- the level of a capacitance between a vehicle occupant on a motor vehicle seat and a ground of the circuit can be controlled.
- the measuring circuit generates a signal as a function of a property influencing the electric field of an object adjacent to the electric field sensor.
- a frequency-dependent signal or a frequency-dependent variable is applied to the electrode and detected at the same time, so that its change can be assigned to a defined change of state within the electric field (for example a seat occupancy).
- US Pat. No. 6,609,055 B2 describes a vehicle occupant recognition system which decides on the occupancy situation of a vehicle seat and thus on the activation or deactivation of safety systems via logical links of a plurality of capacitances thus measured and weight values determined via weight sensors.
- Such a measuring method or measuring system becomes problematic if, due to one or more modifications made within the system to be monitored, a previously unambiguous assignment of the generated signal to a defined state or a defined state change is no longer possible.
- the installation of a child seat according to the ISOFIX standard is such a modification for the already mentioned measuring methods or measuring systems for detecting a motor vehicle seat occupancy.
- ISOFIX is a special form for the secure attachment of child seats or in general Child restraint systems in vehicles.
- About a standard connector of the child seat or the child restraint system is firmly connected to the body of the motor vehicle or the seat frame of the vehicle seat. In this way, on the one hand, the risk of incorrect operation is reduced and the protective effect is improved.
- an ISOFIX compatible child seat is used, then this is electrically connected via its connection with the body or with the seat frame of the vehicle seat and thus possibly also grounded.
- the measuring principles mentioned measure for example, even capacitances of an electrode relative to a ground or ground and distinguish a child seat arranged on the motor vehicle seat from a person by a smaller (capacitive) influencing of the electric field.
- an earthed or grounded ISOFIX child seat is indistinguishable from a human for the corresponding measurement system because it forms a ground shield that completely shields the sensing field, i.e., the frequency dependent quantity (e.g., a sine field).
- the frequency dependent quantity e.g., a sine field.
- the invention is therefore based on the problem of providing an improved measuring system and an improved measuring method, in particular for a motor vehicle.
- a measuring system is provided with at least one first measuring means for detecting at least one frequency-independent electrical variable, in particular a charge, with an evaluation unit for detecting the temporal behavior of the frequency-independent electrical variable (eg charge and discharge times of a capacitor), wherein the evaluation unit the temporal Course of the frequency-independent electrical variable converts into a signal, which in particular a connection state between two components (eg between a child seat and a seat of the motor vehicle) characterized, wherein that signal a frequency-dependent signal is at least partially equivalent. That is, statements about the behavior of frequency-dependent quantities can be made by means of the measuring system.
- a particularly preferred embodiment of the invention makes it possible, in particular, to detect the occupancy of the seat by means of a child seat of the aforementioned type on the basis of a frequency-independent variable.
- a signal based on the temporal behavior of a frequency independent quantity e.g. an amperage or amount of charge at least partially equivalent to a signal of a frequency-dependent magnitude responsible for the activation and / or adjustment of safety-related vehicle systems.
- an electrically conductive part of the latching closure eg ISOFIX stirrup
- This electrode can take charge within a certain time and deliver it within a certain time (discharge).
- Drawer- or unloading time of the free, located on the seat part of the snap closure is used as a reference value. The child seat is thus in a not properly connected to the seat of the motor vehicle state.
- the capacity of the electrode increases and the charging or discharging time of that electrode changes accordingly.
- This change in the charging or discharging time relative to the reference value can be measured.
- the first part of the snap closure can of course be electrically connected to other parts of the child seat or possibly the entire child seat or frame of the child seat.
- the latching closure has two electrically conductive parts or components - one part is located on the child seat, the other part on the seat of the motor vehicle - so that the closed latching closure (both parts or components are electrically connected to each other) has a higher capacity has, as taken on the vehicle seat part taken for themselves.
- a snap closure is provided for example by a known ISOFIX closure.
- the first measuring means comprises a capacitor and / or a coil.
- a measuring means is understood as meaning any electrical or electronic circuit arrangement or electrical or electronic component which is capable of detecting and / or storing an electrical variable or of an evaluation unit or e.g. to forward to a control unit.
- the current, voltage and / or charge is measured as the frequency-independent electrical quantity, e.g. their change from a reference value or their changes in their temporal behavior in a simple
- the time behavior of the frequency-independent variable detected by the evaluation unit is the behavior of a charging and / or a discharging process.
- the at least one measuring device and the at least one evaluation unit are preferably arranged in a vehicle.
- the measuring system according to the invention is of course not limited to the mentioned embodiment but can also be used in connection with other vehicle systems or measuring systems.
- a first electrode of a capacitor is part of a first component, wherein a second electrode of a second component can be coupled to the first electrode is.
- a signal on the mechanical connection state of the first component with the second component can be generated.
- This can be any form of component connection, ie a form, force or material connection.
- a signal characterizing the component connection would then, for example, be equivalent to a signal generated as a function of a frequency-dependent variable, which likewise characterizes a state of a component connection.
- the equivalent frequency-dependent signal generated by the measuring system or an electronic control device is interpreted as coincident, although it does not reflect the state of the component connection.
- the exemplary embodiment with an ISOFIX child seat could be mentioned as an example again, in which the detected connection of the two parts of the snap closure generates a signal which is advantageously completely equivalent to a frequency-dependent signal which "signals" to the measuring system that there is a child seat located on the vehicle seat.
- a child seat not provided with the ISOFIX standard can also be detected with a frequency-dependent size.
- at least one component for example a child seat as a second component, is part of a snap closure, so that at least one signal of the evaluation unit can be used to detect a connection.
- the latching closure of the ISOFIX system is regarded as such a snap closure.
- One idea of the invention is, in particular, to combine the system according to the invention with a measuring system which generates a signal by means of a frequency-dependent variable, to which a specific or defined state or a corresponding state change can be assigned.
- a measuring system which, as already stated, determines the occupancy of a vehicle seat.
- the method according to the invention provides for detecting at least one frequency-independent electrical quantity by means of at least one first measuring means, for detecting the temporal behavior of the frequency-independent electrical variable by means of an evaluation unit, the evaluation unit being based on the time profile of the frequency-independent electrical variable automatically generates a signal that is at least partially equivalent to a frequency-dependent signal.
- the inventive method allows counteracting a frequency dependence of a measuring system by a signal is generated over a frequency-independent variable, which at least partially corresponds to a frequency-dependent signal.
- a plurality of measuring means can be used or a plurality of electrical frequency-independent variables can be detected and evaluated.
- a logical link can also be provided within the evaluation unit, so that the signal generated by the evaluation unit is generated only when the time profiles of all or more of the frequency-independent electrical variables indicate a change of state within the measured (monitored) system.
- an evaluation unit on a motor vehicle seat is intended to generate a signal only when a plurality of ISOFIX latching arms of a child seat are in engagement with ISOFIX latching hooks of the motor vehicle seat.
- FIG. 1 is a perspective view of a motor vehicle seat with a snap closure for securing a child seat to the
- Motor vehicle seat in particular a rear bench
- FIG. 2 shows a schematic, sectional view of the motor vehicle seat of the type shown in FIG. 1, with a measuring system according to the invention
- Fig. 3 is a perspective view of a portion of a motor vehicle seat of the type shown in Figures 1 and 2, with a snap closure (ISOFIX) for attaching a child seat to the vehicle seat (the latching principle);
- ISOFIX snap closure
- FIG. 4 shows a schematic, partially sectioned view of the latching closure shown in FIG. 3;
- FIG. 5 is a block diagram of a measuring system for detecting the occupancy of a
- I and Q are the in-phase reactive current components of the current sent to the sensor. These are used for classification in wet seats;
- 6 is another block diagram of a measuring system for detecting the
- FIG. 7 shows a schematic, sectional view of a motor vehicle seat, with a seat occupant occupant
- FIG. 8 shows a schematic representation of an arrangement for detecting the presence of a person on the basis of capacity measurements
- FIG. 9 is a block diagram of a measurement system for determining the occupancy of a motor vehicle seat (for example, a child seat).
- FIG. 1 shows a perspective rear view of a seat frame 4a of a motor vehicle seat 4 consisting of a seat part 401 and a backrest 402, which are articulated to each other in a known manner via a seat adjustment mechanism 10.
- a seat adjustment mechanism 10 In order to ensure that the backrest 402 relative to the seat part 401 can also be pivoted in the direction of the same in the upholstered state, said two parts of the motor vehicle seat 4 are spaced apart in a region 403 between the seat adjustment mechanism 10 connecting them laterally.
- an ISOFIX latching clip 2 is provided on the seat part 401 or the seat frame 4.
- ISOFIX locking clip 2 At the ISOFIX locking clip 2 are spaced apart from each other symmetrically to a seat longitudinal axis two ISOFIX locking hooks 1 attached or molded. These provide a connection to the seat frame 4a of the motor vehicle seat 4 or are part of the seat frame 4a.
- the motor vehicle seat 4 of Figure 1 is shown with padding.
- the seat part 401 is provided with a cushion part 9 for providing a padded seat 90 and facing the seat part 401
- Sectional view is also a rigid rear wall 11 of the backrest 402 can be seen, which is provided on a side facing away from the seat surface 90 of the padded seat part 401 side of the backrest 402.
- a so-called Elo box 12 In the free area 403 between the backrest 402 and the seat part 401, a so-called Elo box 12, so a computer or evaluation unit, arranged, which is in operative connection with the ISOFIX bracket 2. Of course, it can also be used directly in conjunction with the ISOFIX locking hooks 1. All that matters is that the Elo box 12 is coupled to the ISOFIX components of the seat frame 4a so that it can detect an engagement of an ISOFIX locking arm with an ISOFIX locking hook 1. This means in this context that they have an applied Lade standing. Entladevorgang respectively whose temporal course of the considered as an electrode ISOFIX latching clip 2 and the ISOFIX latching hook 1 can detect and evaluate.
- FIG. 3 is a perspective view of the principle of operation of the ISOFIX child seat system illustrated.
- the motor vehicle seat 4 is here part of a rear seat of a motor vehicle and provides between the padded seat part 401 and the padded backrest 402 an opening 405, which is arranged next to a buckle receptacle 404 for inserting a lock tongue of a seat belt.
- an ISOFIX locking arm 301 of a child seat 3 is inserted, which is arranged on a child seat frame 3 a of the child seat 3.
- the ISOFIX latching arm 301 is located on a rear side of the child seat 3 facing the backrest 402 and extends substantially perpendicularly from it in the direction of the backrest 402.
- the ISOFIX latching arm 301 After insertion into the opening 405, engages between the backrest 402 and the backrest 402
- the ISOFIX latching clip 2 or only the ISOFIX latching hook 1 are used as the first electrode of a capacitor in the sense of a measuring device which is in the unconnected state, ie without connection to an ISOFIX child seat 3, are applied with a frequency-independent variable to determine a reference value.
- the ISOFIX latching clip 2 or the ISOFIX latching hook 1 are repeatedly charged or discharged as the first electrode of a capacitor, and the time course of the charging or discharging process is determined as a reference.
- the ISOFIX latching hook 1 is coupled to an evaluation unit in the form of the Elo-box 12 via a contact 120 or a line element which determines and evaluates said time profile.
- the loading or unloading operation may of course be carried out continuously or only for a certain period of time, e.g. after opening the motor vehicle a predefined duration, and / or with a predetermined frequency.
- the ISOFIX locking arm 301 of the child seat 3 is electrically connected to the ISOFIX locking hook 1, this forms a second electrode of the capacitor and the time course of the charging or discharging process is changed.
- the Elo box 12 detects the resulting resulting change in the time course of the frequency-independent variable, for example, the charging or discharging, and generates a signal that leads, for example, to shutdown of the airbag system. In principle, therefore, the risk of injury to a child located in the child seat 3 should be reduced by an airbag deploying in the event of a crash.
- the corresponding signal of the Elo box 12 is equivalent to a signal that is generated by a frequency-dependent detection or measuring device for seat occupancy, for example, to determine the occupancy of the motor vehicle seat 4 with a child seat, which is not equipped with ISOFI
- the contacting 120 of the evaluation unit corresponding to FIG. 4, the Elo box 12, not permanently connected to the ISOFIX latch hook 1 or the ISOFIX latch 2 is.
- the contacting 120 may e.g. separated from the ISOFIX latch hook 1 and coupled directly to the ISOFIX latch arm 301.
- the contacting can e.g. be designed as a preloaded conductive spring or resiliently mounted.
- An inserted through the opening 405 end of the ISOFIX locking arm 301 could then change overcoming a spring force, the position of the contact 120, for example, move it in the direction of insertion of the ISOFIX locking arm 301.
- the coupling of the contacting 120 with the ISOFIX locking hook 1 could be separated and at the same time an electrically conductive connection of the contacting 120 with the ISOFIX locking arm 301 realized. Accordingly, a change in the course over time, e.g. detect the charged via the contact 120 charging and discharging.
- FIG. 5 shows a block diagram of a control system 21 with a power supply 14, which is ensured by a battery supply voltage V Ba tte ⁇ e.
- the control system 21 has a connection to a harness 16 of the seat, eg for connection to a passive or active security system.
- the connection to the cable harness 16 is provided via a CAN bus 15, so a common in the automotive field communication system for connection to a control unit.
- the CAN-BUS 15 is coupled to a microprocessor 17, which in turn controls a sine wave generation 18 and a sampling current measurement 19 associated therewith.
- a detection unit 20 as a measuring means with a Senstechniks- or sensing element 5, e.g. an electrical sensor or heating mat, connected outside the control system 21.
- a detection unit 20 is supplied with a sine signal, e.g. a 12 kHz harmonic sine signal, a current I and a charge Q can be measured, which the microprocessor 17 evaluates.
- the sensing elements 5 or sensors which may also be considered independent of the detection unit 20 as measuring means according to the invention are usually located below the seat 90 in the cushion part 9 of the seat part 401 and in the backrest 402. By feeding with an oscillating signal that generates Scanning element 5 an electric field.
- the sensing element 5 is advantageously designed as a capacitive sensor, so that a capacitance of a first electrode of the sensing element 5 with respect to a ground, present e.g. the reference potential of the seat frame 4a or a vehicle floor 7, can be measured.
- a ground present e.g. the reference potential of the seat frame 4a or a vehicle floor 7
- the electric field and thus the measured capacitance are affected. From this influencing of the frequency-dependent variable, a seat occupancy or the type of seat occupancy can then be detected.
- the detected capacity is increased significantly by a vehicle occupant 6 located on the motor vehicle seat 4 in the normal case and the capacity is increased only slightly or scarcely by a child seat without ISOFIX system.
- An increase of this detected, frequency-dependent variable accordingly leads, for example, to a generation of a signal which activates the safety systems of the motor vehicle for the motor vehicle seat 4.
- the wetness of a motor vehicle seat 4 or the upholstery parts 8 and 9, in which a sensing element 5 is located can have a considerable influence on the capacitance of the sensing element 5 with respect to a reference potential or a ground.
- a conductive liquid on the sensing element 5 increases the detected capacitance. Therefore, for wet seating, in addition, the reactive and resistive component of the impedance between the sensing element 5 and a ground, ie grounding, is regularly measured and a distinction made for the type of seat occupancy in wet seats using real and imaginary part of the current.
- the I and Q values sensed by the microprocessor 17 in FIG. 5 are the in-phase and reactive current components of the supply current sent to the sensing element 5, which are used to classify seat occupancy in wet or wet seats.
- An embodiment of a measuring system of the prior art for detecting the occupancy of a motor vehicle seat 4 shows the block diagram of Fig. 6. The detection is carried out in connection with a grounded motor vehicle seat 4 and housed therein in the seat part 401 heating mat as a scanning element 5 or detection unit.
- an electronic control unit 23 is here via an 8-pin connection with Vßatte ⁇ e. a ground 30, a first CAN bus 31, a second CAN bus 32, the grounding lines 33 and 34 of the motor vehicle seat 4, a first and second grounding line 35 and 36 connected to a heating device 27.
- the said eight connections or connection lines also lead to an electronic control unit 26 for the heating device 27 and have a branch to a cable harness connector 28.
- the harness connector 28 provides a connection to a connector 27 a of the heater 27.
- the heating device 27 then comprises the sensing element 5 designed as a sensor or heating mat and has a permanent connection 25 between the electronic control unit 23 and the heating mat.
- the permanent connection 25 is realized via a two-wire connection 24 to the electronic control unit 23.
- a simple insulation is not enough to decouple the ISOFIX locking clip 2 from the rest of the mass, because it is not a "DC" resistor but an impedance.
- an analog measuring method with a frequency-dependent measuring method in particular one of those shown in FIGS. 5-7, connected to detect ISOFIX child seats 3 in this particular preferred embodiment and then disable passive or active safety systems that mean a risk to an occupant, or to prevent their triggering.
- this also allows the detection of child seats possible, which, although not ISOFIX standard, but also by means of the described frequency-dependent measurement methods or systems are not clearly distinguishable from a person due to comparable limitations.
- ISOFIX locking bracket 2 and seat frame 4a would ensure, but the insulation is still clearly too small to provide in the illustrated case, a complete electromagnetic decoupling.
- a capacitor is provided in the present exemplary embodiment which is charged and discharged continuously.
- the loading and unloading time is used as reference.
- the ISOFIX locking clip 2 is used as an electrode.
- the charging of this electrode with its geometric properties takes a certain time like a capacitor. This time is used (after being subtracted from the reference time) to represent an "O" state, and if the area of the electrode is increased by connecting the child seat 3, that time also increases and it is recognized that the ISOFIX Child seat 3 was installed, resulting in a "1" state.
- FIG. 9 shows a block diagram for determining the characteristic frequency-independent quantities of an electrode 7a (such as charging time and discharge time of the electrode 7a).
- the electrode 7a may be, for example, part of an (ISOFIX) snap fastener for the child seat 3, in particular the second part of the (ISOFIX) snap fastener provided on the motor vehicle seat 4, eg the ISOFIX snap-in clip 2 or the ISOFIX snap-in hook 1. Consequently, the circuit shown in FIG. 9 could also be part of the evaluation unit or the Elo box 12 of the preceding FIGS. 1-4.
- a start instruction 45 to a conventional electronic signal sequence controller 46 (so-called “burst controller"), a in single-slope switched capacitor or analog-to-digital converter 40 is driven.
- the charging or discharging of the electrode 7a and a capacitance Cs defined as a function of the sensitivity is evaluated, which is connected via connecting lines 41 and 42 to the analog-to-digital converter 40.
- the electrode 7a has a capacitive ground Cx.
- the time course of the charging or discharging process is forwarded to the analog-to-digital converter 40.
- a signal 47 which reproduces the currently detected state of the electrode 7a, that is, for example, signals a "1" state in the case of an increased capacitance of the electrode 7a.
- This signal 47 defines e.g. whether the child seat 3 is electrically connected via its ISOFIX locking arm 301 with the ISOFIX locking bracket 2, so that the loading or unloading time of the electrode 7a has changed, now the ISOFIX locking arm 301 and the ISOFIX locking hooks 1 and if necessary, the ISOFIX locking clip 2 includes. This change in the loading or unloading time can be detected by the ISOFIX child seat 3 to determine the occupancy of the motor vehicle seat 4.
- start instruction / signal (start)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- General Health & Medical Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Seats For Vehicles (AREA)
- Air Bags (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007022463A DE102007022463A1 (de) | 2007-05-09 | 2007-05-09 | Messsystem |
PCT/EP2008/055716 WO2008138870A1 (de) | 2007-05-09 | 2008-05-08 | Messsystem und messverfahren zur erfassung mindestens einer frequenzunabhängigen elektrischen grösse |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2146866A1 true EP2146866A1 (de) | 2010-01-27 |
Family
ID=39769003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08750209A Withdrawn EP2146866A1 (de) | 2007-05-09 | 2008-05-08 | Messsystem und messverfahren zur erfassung mindestens einer frequenzunabhängigen elektrischen grösse |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100057304A1 (de) |
EP (1) | EP2146866A1 (de) |
JP (1) | JP5203452B2 (de) |
CN (1) | CN101678780B (de) |
DE (1) | DE102007022463A1 (de) |
WO (1) | WO2008138870A1 (de) |
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DE102009055426A1 (de) | 2009-12-30 | 2011-07-07 | Takata-Petri Ag, 63743 | Kapazitive Sensorbaugruppe |
DE102009055424A1 (de) | 2009-12-30 | 2011-07-07 | Takata-Petri Ag, 63743 | Kapazitive Sensorbaugruppe |
JP5560784B2 (ja) * | 2010-03-11 | 2014-07-30 | トヨタ紡織株式会社 | ハイブリッド乗員検知システム |
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LU92957B1 (en) * | 2016-01-25 | 2017-08-07 | Iee Sa | Capacitive occupant classification sensor with load-dependent antenna area |
CN106740310B (zh) * | 2017-01-06 | 2019-06-28 | 上海沃雨电子科技有限公司 | 儿童安全座椅isofix与靠背联动调节的***及方法 |
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-
2008
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- 2008-05-08 JP JP2010506941A patent/JP5203452B2/ja not_active Expired - Fee Related
- 2008-05-08 EP EP08750209A patent/EP2146866A1/de not_active Withdrawn
- 2008-05-08 CN CN2008800152562A patent/CN101678780B/zh not_active Expired - Fee Related
-
2009
- 2009-11-06 US US12/591,076 patent/US20100057304A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
US20100057304A1 (en) | 2010-03-04 |
CN101678780A (zh) | 2010-03-24 |
WO2008138870A1 (de) | 2008-11-20 |
JP2010528258A (ja) | 2010-08-19 |
CN101678780B (zh) | 2012-12-26 |
JP5203452B2 (ja) | 2013-06-05 |
DE102007022463A1 (de) | 2008-11-13 |
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