Passenger detection system and detection method
First Claim
1. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and connecting to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field; and
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data.
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Accused Products
Abstract
A passenger detection system is presented so that the master control circuit in the system instructs the passenger airbag control circuit controlling the operation of the airbag designated for the passenger seat to be in the deployable state or not-deployable state, depending on the seating conditions of a passenger sitting on the passenger seat, for example whether the passenger is an adult or a child. The passenger detection system is operated by a plurality of antenna electrodes disposed on the passenger seat; an electric field generation device for generating an electric field around an antenna electrode; a switching circuit for connecting the electric field generation device to the various antenna electrodes; an information detection circuit for detecting information related to a current flowing in a particular antenna electrode selected by the switching circuit; a master control circuit for receiving signal data output from the information detection circuit, and judging passenger seating conditions according to the signal data; and an airbag apparatus for controlling the operation of an airbag designated for the driver seat and an airbag designated for the passenger seat.
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Citations
64 Claims
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1. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and connecting to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field; and
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data. - View Dependent Claims (3)
- a plurality of antenna electrodes disposed separately on a seat;
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2. A passenger detection system having a plurality of antenna electrodes disposed separately on a seat;
- an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field;
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data; and
an airbag apparatus for enabling to deploy, upon collision, an airbag designated for said seat;
wherein said airbag apparatus is instructed by said control circuit to be either in the deployable state or not-deployable state according to judging data generated by said control circuit.
- an electric field generation device for generating a weak electric field around an antenna electrode;
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4. A passenger detection method comprising the steps of:
- disposing a plurality of antenna electrodes separately on a seat;
selecting a particular antenna electrode from said plurality of antenna electrodes;
generating an electric field on said particular antenna electrode;
detecting information related to a current flowing in said particular antenna electrode resulting from applying said electric field; and
judging passenger seating conditions according to signal data related to said information.
- disposing a plurality of antenna electrodes separately on a seat;
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5. A passenger detection method comprising the steps of:
- disposing a plurality of antenna electrodes separately on a seat;
selecting a particular antenna electrode from said plurality of antenna electrodes;
generating an electric field on said particular antenna electrode;
detecting information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field;
evaluating passenger seating conditions according to signal data related to said information and producing a judgment;
sending said judgment to an airbag apparatus so as to place an airbag of said airbag apparatus either in the deployable state or not-deployable state.
- disposing a plurality of antenna electrodes separately on a seat;
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6. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
an amplitude control circuit for maintaining an amplitude of forward signals substantially constant;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field; and
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data. - View Dependent Claims (8, 9)
- a plurality of antenna electrodes disposed separately on a seat;
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7. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
an amplitude control circuit for maintaining an amplitude of forward signals substantially constant;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field;
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data; and
an airbag apparatus for deploying, upon collision, an airbag designated for said seat;
wherein said airbag apparatus is programmed by said control circuit to be either in the deployable state or not-deployable state according to judging data generated by said control circuit.
- a plurality of antenna electrodes disposed separately on a seat;
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10. A passenger detection method comprising the steps of:
- disposing a plurality of antenna electrodes separately on a seat;
selecting a particular antenna electrode from said plurality of antenna electrodes;
generating an electric field on said particular antenna electrode by impressing field signals, whose voltage amplitude is controlled substantially constant, on said particular antenna electrode;
detecting information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field; and
judging passenger seating conditions according to signal data related to said information.
- disposing a plurality of antenna electrodes separately on a seat;
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11. A passenger detection method comprising the steps of:
- disposing a plurality of antenna electrodes separately on a seat;
selecting a particular antenna electrode from said plurality of antenna electrodes;
generating an electric field on said particular antenna electrode by impressing field signals, whose voltage amplitude is controlled substantially constant, on said particular antenna electrode;
detecting information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field;
evaluating passenger seating conditions according to signal data related to said information and producing a judgment; and
sending said judgment to an airbag apparatus so as to place an airbag of said airbag apparatus either in the deployable state or not-deployable state.
- disposing a plurality of antenna electrodes separately on a seat;
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12. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field; and
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data;
wherein control circuit includes;
memory means for storing initial data SDn as reference data, obtained in a reference state including a vacant seat state by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
reception means for receiving detected data ADn, obtained when starting said passenger detection system by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode; and
judging means for computing a difference between said detected data ADn and said initial data SDn to produce essentially data DTn, where DTn=SDn−
ADn, and judging passenger seating conditions according to said essentially true data.
- a plurality of antenna electrodes disposed separately on a seat;
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13. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flowing in said particular antenna electrode resulting from applying said particular electric field;
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data;
an airbag apparatus having a capability to select an operational state of an airbag designated for said seat; and
communication means for sending judgment data, based on a judgment derived by said control circuit, to said airbag apparatus;
wherein control circuit includes;
memory means for storing initial data SDn as reference data, obtained in a reference state including a vacant seat state by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
reception means for receiving detected data ADn, obtained when starting the passenger detection system, by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode; and
judging means for computing a difference between said detected data ADn and said initial data SDn to produce essentially true data DTn, where DTn=SDn−
ADn, and judging passenger seating conditions according to said essentially true data.
- a plurality of antenna electrodes disposed separately on a seat;
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14. A passenger detection method for a passenger detection system to detect seating conditions of a passenger seated on a seat by generating an electric field successively in a plurality of antenna electrodes disposed on said seat, detecting information related to a current flow in each antenna electrode caused by respective impressed electric field and judging passenger seating conditions according to said information, wherein said method includes the steps of:
- storing initial data SDn as reference data obtained in a reference state including a vacant seat state, produced by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
receiving detected data ADn, obtained after starting said passenger detection system, by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
computing a difference between said detected data ADn and said initial data SDn to produce essentially true data DTn, where DTn=SDn−
ADn; and
evaluating passenger seating conditions according to said essentially true data.
- storing initial data SDn as reference data obtained in a reference state including a vacant seat state, produced by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
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15. A passenger detection method for a passenger detection system to detect seating condition of a passenger seated on a seat by generating an electric field around each of a plurality of antenna electrodes disposed on said seat, detecting information related to a current flow in each antenna electrode caused by respective impressed electric field, judging seating conditions based on signal data related to said information, and sending said judgment to an airbag apparatus so as to place an airbag of said airbag apparatus either in the deployable state or not-deployable state, wherein said method includes the steps of:
- initializing sensors so as to store initial data SDn as reference data obtained in a reference state including a vacant seat state, produced by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode; and
after starting said passenger detection system, receiving detected data ADn, produced by successively impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
computing a difference between said detected data ADn and said initial data SDn to produce essentially true data DTn, where DTn=SDn−
ADn;
evaluating passenger seating conditions according to said true data;
sending resulting evaluation data to airbag apparatus using communication means; and
prior to placing said airbag apparatus in a selected operational state, performing an SRS process by exchanging evaluation data between a passenger detection circuitry and an airbag apparatus circuitry to examine whether or not there is abnormality in communication circuitry.
- initializing sensors so as to store initial data SDn as reference data obtained in a reference state including a vacant seat state, produced by impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode; and
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16. A passenger detection system having a plurality of antenna electrodes disposed separately on a seat;
- an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular antenna electrode from said plurality of antenna electrodes and providing an electrical connection to said electric field generation device;
an information detection circuit for generating a particular electric field around said particular antenna electrode, and obtaining information related to a current flow resulting from said particular electric field;
a control circuit for receiving signal data from said information detection circuit and judging passenger seating conditions on said seat according to said signal data;
an airbag apparatus for enabling to deploy, upon collision, an airbag designated for said seat; and
communication means for sending a resulting judgment to said airbag apparatus, wherein resulting evaluation data are sent to airbag apparatus using communication means; and
prior to placing said airbag apparatus either in the deployable state or not-deployable state, checking system operation by exchanging evaluation data between a passenger detection circuitry and an airbag apparatus circuitry to examine whether or not there is abnormality in a communication circuitry between said passenger detection circuitry and said airbag apparatus circuitry.
- an electric field generation device for generating a weak electric field around an antenna electrode;
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17. A passenger detection method comprising the steps of:
- generating an electric field successively around a plurality of antenna electrodes disposed on a seat;
detecting information related to a current flowing in successive antenna electrodes;
receiving signal data regarding said information;
evaluating passenger seating conditions according to received signal data and producing a judgment;
sending said judgment to an airbag apparatus; and
prior to placing an airbag of said airbag apparatus in a selected operational state;
checking system operation by exchanging SRS data between a passenger detection circuitry and an airbag apparatus circuitry to examine whether or not there is abnormality in a communication circuitry between said passenger detection circuitry and said airbag apparatus circuitry. - View Dependent Claims (19)
- generating an electric field successively around a plurality of antenna electrodes disposed on a seat;
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18. A passenger detection method for a passenger detection system to detect passenger seating conditions on a seat by generating an electric field successively around a plurality of antenna electrodes disposed on a seat;
- detecting information related to a current flowing in successive antenna electrodes;
judging passenger seating conditions according to signal data on said information; and
sending a resulting judgment to an airbag apparatus so as to place an airbag designated for said seat either in the deployable state or not-deployable state, wherein when said seat is vacant, generating an electric field successively on said plurality of antenna electrodes;
detecting information related to a current flowing in successive antenna electrode resulting from applying said electric field;
initializing sensors so as to store initial data SDn obtained, in a reference state including a vacant seat state, by generating an electric field successively on a plurality of antenna electrodes and detecting information related to a current flow caused by respective electric field; and
after starting said passenger detection system, receiving detected data ADn, produced by successively impressing an electric field on each antenna electrode and detecting a resulting current flow in each antenna electrode;
computing a difference between said detected data ADn and said initial data SDn to produce essentially true data DTn, where DTn=SDn−
ADn;
evaluating passenger seating conditions according to said essentially true data;
sending resulting evaluation data to airbag apparatus using communication means; and
prior to placing said airbag apparatus in a selected operational state, performing an SRS process by exchanging evaluation data between a passenger detection circuitry and an airbag apparatus circuitry to examine whether or not there is abnormality in a communication circuitry between said passenger detection circuitry and said airbag apparatus circuitry.
- detecting information related to a current flowing in successive antenna electrodes;
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20. A passenger detection system comprised by an antenna electrode disposed on a seat and/or a vicinity of said seat, generation means for generating an electric field around said antenna electrode, detection means for detecting information related to a current flowing in said antenna electrode, and evaluation means for evaluating passenger seating conditions according to said information, wherein said antenna electrode is comprised by an antenna electrode section made of an electrically conductive material, and said antenna electrode section surrounds a planar space where there is no antenna electrode.
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21. A passenger detection system comprised by an antenna electrode disposed on a seat and/or a vicinity of said seat, generation means for generating an electric field around said antenna electrode, detection means for detecting information related to a current flowing in said antenna electrode, evaluation means for evaluating passenger seating conditions according to said information, controlling means for selecting an operational state of an airbag apparatus according to said information, wherein said antenna electrode is comprised by an antenna electrode section made of an electrically conductive material, and said antenna electrode section surrounds a planar space where there is no antenna electrode.
- 22. An antenna electrode placed on a seat and/or a vicinity of said seat constructed so as to be used in a passenger detection system to generate an electric field around said antenna electrode, detect information related to a current flowing in said antenna electrode, and evaluate passenger seating conditions according to said information, wherein said antenna electrode is comprised by an antenna electrode section made of an electrically conductive material, and said antenna electrode section surrounds a planar space where there is no antenna electrode.
- 23. An antenna electrode placed on a seat and/or a vicinity of said seat constructed so as to be used in a passenger detection system to generate an electric field around said antenna electrode, detect information related to a current flowing in said antenna electrode, and evaluate passenger seating conditions according to said information, wherein said antenna electrode is comprised at least by an insulating base member and an antenna electrode section made of an electrically conductive material, and a lead wire having an electrical connection to said antenna electrode section, and said antenna electrode section surrounds a planar space where there is no antenna electrode.
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30. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a current detection circuit for applying said weak electric field to a particular antenna electrode and detecting a resulting current flowing in said particular antenna electrode; and
a control circuit for evaluating passenger sitting conditions according to signal data received from said current detection circuit;
wherein all antenna electrodes, excepting said particular antenna electrode selected for generating an electric field, are impressed with a direct current potential or earth potential.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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31. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit having a plurality of switching devices for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
a current detection circuit for applying said weak electric field to said particular antenna electrode and detecting a resulting current flowing in said particular antenna electrode; and
a control circuit for evaluating passenger sitting conditions according to signal data received from said current detection circuit;
wherein all antenna electrodes, excepting said particular antenna electrode selected for generating an electric field, are impressed with a direct current potential or earth potential.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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32. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a current detection circuit for applying said weak electric field to a particular antenna electrode and detecting a resulting current flowing in said particular antenna electrode; and
a control circuit for evaluating passenger sitting conditions according to signal data received from said current detection circuit;
wherein all antenna electrodes, excepting said particular antenna electrode selected for generating an electric field, are impressed with a direct current potential or earth potential, and evaluation data from said control circuit are sent to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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33. A passenger detection method by generating a weak electric field selectively around a particular antenna electrode selected from a plurality of antenna electrodes disposed separately on a sitting section and/or backrest section of a seat;
- applying a direct current potential or earth potential to all antenna electrodes excepting said particular antenna electrode; and
evaluating passenger seating conditions according to signal data of a perturbation current resulting from applying said weak electric field.
- applying a direct current potential or earth potential to all antenna electrodes excepting said particular antenna electrode; and
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34. A passenger detection method by generating a weak electric field selectively around a particular antenna electrode selected from a plurality of antenna electrodes disposed separately on a sitting section and/or backrest section of a seat;
- applying a direct current potential or earth potential to all antenna electrodes excepting said particular antenna electrode; and
evaluating passenger seating conditions according to signal data of a perturbation current resulting from applying said weak electric field to produce an evaluation result, and sending instruction data based on said evaluation result from said control circuit to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- applying a direct current potential or earth potential to all antenna electrodes excepting said particular antenna electrode; and
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35. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an information detection circuit for applying said weak electric field to said particular antenna electrode and detecting information related to a current flowing in said particular antenna electrode resulting from applying said weak electric field; and
a control circuit for evaluating passenger sitting conditions according to signal data received from said information detection circuit;
wherein said electric field generation device outputs high frequency low voltage signals having a rectangular waveform. - View Dependent Claims (37, 38, 39)
- a plurality of antenna electrodes disposed separately on a seat;
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36. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a seat;
an electric field generation device for generating a weak electric field around an antenna electrode by outputting high frequency low voltage signals having a rectangular waveform;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an information detection circuit for applying said weak electric field to said particular antenna electrode and detecting information related to a current flowing in said particular antenna electrode resulting from applying said weak electric field; and
a control circuit for evaluating passenger sitting conditions according to signal data received from said information detection circuit to produce an evaluation result, and sending instruction data based on said evaluation result from said control circuit to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- a plurality of antenna electrodes disposed separately on a seat;
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40. A passenger detection method by generating a weak electric field selectively around a particular antenna electrode selected from a plurality of antenna electrodes disposed separately on a seat;
- applying high frequency low voltage signals of a rectangular waveform on said particular antenna electrode; and
detecting information related to perturbation current flowing is said particular antenna electrode; and
evaluating passenger seating conditions according to signal data related to said information.
- applying high frequency low voltage signals of a rectangular waveform on said particular antenna electrode; and
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41. A passenger detection method by generating a weak electric field selectively around a particular antenna electrode selected from a plurality of antenna electrodes disposed separately on a seat;
- applying high frequency low voltage signals of a rectangular waveform on said particular antenna electrode; and
detecting information related to a perturbation current flowing is said particular antenna electrode; and
evaluating passenger seating conditions according to signal data related to said information to produce an evaluation result, and sending instruction data based on said evaluation result from said control circuit to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- applying high frequency low voltage signals of a rectangular waveform on said particular antenna electrode; and
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42. A passenger detection system comprising:
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around said antenna electrode;
an ac-dc conversion circuit for converting an alternating current line voltage in a forward line, related to a perturbation current flowing in said antenna electrode resulting from said weak electric field generated around said antenna electrode produced by connecting said antenna electrode to said electric field generation device, to a direct current voltage; and
a control circuit for judging passenger seating conditions according to evaluation data output from said conversion circuit. - View Dependent Claims (48, 49, 50, 51, 52, 53)
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
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43. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an ac-dc conversion circuit for applying said weak electric field to said particular antenna electrode, and converting a resulting alternating current line voltage in a forward line related to a perturbation current flowing in said particular electrode to a direct current voltage; and
a control circuit for judging passenger seating conditions according to signal data output from said conversion circuit.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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44. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode to serve as a sending electrode and selecting a pairing electrode serving a receiving electrode, and connecting said electric field generation device to said particular antenna electrode;
an ac-dc conversion circuit for generating a weak electric field between a resulting pair of antenna electrodes, and converting a resulting alternating current line voltage in a forward line related to a perturbation current flowing in said particular electrode to a direct current voltage; and
a control circuit for judging passenger seating conditions according to signal data output from said conversion circuit.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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45. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an ac-dc conversion circuit for applying said weak electric field to said particular antenna electrode, and converting a resulting alternating current line voltage in a forward line related to a perturbation current flowing in said particular electrode to a direct current voltage; and
a control circuit for judging passenger seating conditions according to signal data output from said conversion circuit to produce an evaluation result, and sending instruction data based on said evaluation result from said control circuit to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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46. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an ac-dc conversion circuit for applying said weak electric field to said particular antenna electrode, and converting a resulting alternating current line voltage in a forward line related to a perturbation current flowing in said particular electrode to a direct current voltage; and
a control circuit for judging passenger seating conditions according to signal data output from said conversion circuit.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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47. A passenger detection system comprising:
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
a switching circuit for selecting a particular electrode and connecting said electric field generation device to said particular antenna electrode;
an ac-dc conversion circuit for applying said weak electric field to said particular antenna electrode, and converting a resulting alternating current line voltage in a forward line related to a perturbation current flowing in said particular electrode to a direct current voltage; and
a control circuit for judging passenger seating conditions according to signal data output from said conversion circuit to produce an evaluation result, and sending instruction data based on said evaluation result from said control circuit to an airbag apparatus so as to place an airbag designated for said seat in the deployable state or not-deployable state.
- a plurality of antenna electrodes disposed separately on a sitting section and/or a backrest section of a seat;
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54. A passenger detection system comprising:
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around said antenna electrode;
an antennae interface circuit including a detection circuit for detecting information related to a perturbation current flowing in said antenna electrode resulting from applying a power from said electric field generation device;
a correction interface circuit including a detection circuit for detecting information related to a perturbation current flowing in said antenna electrode resulting from applying a power from said electric field generation device; and
a control circuit for correcting signals output from said antennae interface circuit according to signal data output from said antennae interface circuit and said correction interface circuit;
wherein said antennae interface circuit and said correction interface circuit are configured similarly and said antennae interface circuit is connected to an antenna electrode and said correction interface circuit is not connected to an antenna electrode and is open-circuited. - View Dependent Claims (56, 57, 58, 59, 60, 61)
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
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55. A passenger detection system comprising:
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
an electric field generation device for generating a weak electric field around an antenna electrode;
an antennae interface circuit including a detection circuit for detecting information related to a perturbation current flowing in an antenna electrode resulting from applying a power from said electric field generation device;
a correction interface circuit including a detection circuit for detecting information related to a perturbation current flowing in an antenna electrode resulting from applying a power from said electric field generation device;
a control circuit for correcting signals output from said antennae interface circuit according to signal data output from said antennae interface circuit and said correction interface circuit; and
an airbag apparatus that can be placed in a specific operational state according to judgment data generated by said control circuit;
wherein said antennae interface circuit and said correction interface circuit are configured similarly and said antennae interface circuit is connected to an antenna electrode and said correction interface circuit is not connected to an antenna electrode and is open-circuited.
- an antenna electrode disposed on a sitting section and/or a backrest section of a seat;
- 62. A passenger detection system comprised by antenna electrodes disposed on a seat inside an automobile connected, using a shielding cable whose signal line is shielded by a shielding line, to a signal processing circuit for detecting passenger seating conditions by processing signal data related to a perturbation current flowing in an antenna electrode resulting from applying an electric field generated about said antenna electrode, wherein a buffer circuit, for maintaining signal levels of signal line and shield line at a same level, is connected between said signal line and said shield line.
Specification