JP5613403B2 - Vehicle seat state determination device - Google Patents

Description

  The present invention relates to a seat state determination device for determining the state of a vehicle seat.

  In recent years, in order to protect vehicle occupants, development of vehicles equipped with seat belts and airbags has been promoted. Seat belts and airbags are often installed in the passenger seat in addition to the driver seat. A child seat for seating a small child may be attached to the passenger seat, and luggage may also be placed. In this case, it is necessary to temporarily stop the operation of the seat belt pretensioner and the airbag. For this reason, development of a sheet state determination device for determining the state of a sheet is underway (see, for example, Patent Document 1).

  The seat state determination device known in Patent Document 1 includes a plurality of load sensors that detect loads applied to the seat body, and an electronic control device that performs occupant determination based on detection information detected by these load sensors. That's what it means.

  More specifically, the electronic control device has a single transmission port and a plurality of reception ports. The single transmission port is a terminal for transmitting an information request signal for requesting detection information to all of the plurality of load sensors from the electronic control device. The plurality of receiving ports are terminals for receiving detection information generated by the plurality of load sensors, and have the same number as the plurality of load sensors. The electronic control device can perform the occupant determination based on the detection information detected by the plurality of load sensors.

  The electronic control device transmits information request signals simultaneously to each of the plurality of load sensors from a single transmission port. The plurality of load sensors that simultaneously receive the information request signals individually detect the load, and transmit the detection information to the respective reception ports via the signal lines (harnesses). Since each load sensor transmits a detection signal to each reception port via an individual signal line, a plurality of detection signals can be transmitted simultaneously. For this reason, each detection information received by the electronic control device does not change due to a shift in detection timing. That is, so-called simultaneity of a plurality of pieces of detection information can be ensured.

  However, such conventional technology requires the same number of receiving ports as a plurality of load sensors. As the number of components of the electronic control device increases, the configuration must be complicated accordingly. For this reason, there is a limit in reducing the cost of the sheet state determination apparatus.

JP 2006-38714 A

  It is an object of the present invention to provide a technique capable of appropriately determining the state of a seat based on detection information of a plurality of detection sensors and reducing the cost of a vehicle seat state determination device. To do.

  The invention according to claim 1 is a plurality of detection sensors that individually detect information related to a vehicle seat, and a determination unit that determines the state of the seat based on each detection information detected by the plurality of detection sensors. In the vehicular seat state determination device, the determination unit transmits a single transmission port for transmitting an information request signal for requesting each detection information to all of the plurality of detection sensors. And a single reception port for receiving each of the detection information issued by the plurality of detection sensors in response to the information request signal, and the plurality of detection sensors have the same timing as each other. The detection information individually detected in step (b) is stored, and the stored detection information is stored in the single reception port at different timings in response to the information request signal. Characterized in that it is intended to transmit to the bets.

The invention according to claim 2 is characterized in that each timing at which each of the plurality of detection sensors transmits each detection information is set in advance with reference to the timing at which the information request signal is received. In addition, in the inventions according to the first and second aspects, not only the information request signal but also the sample hold signal for requesting detection at the same timing can be transmitted by a single transmission port.

  In the invention according to claim 1, the plurality of detection sensors individually detect and store information about the sheet at the same timing, and each of the stored detection information is used as an information request signal from the determination unit. In response, the data are transmitted to the determination unit at different timings.

  As described above, the plurality of detection sensors detect the information regarding the sheet at the same detection timing. For this reason, each detection information does not change due to a shift in detection timing. That is, so-called simultaneity of a plurality of pieces of detection information can be ensured. On the other hand, since the receiving port receives a plurality of detection information at different timings, only one receiving port is required. In addition, since the receiving port only sequentially receives a plurality of detection information detected at the same timing, each detection information does not change due to a shift in detection timing. In spite of the fact that there is only one reception port for a plurality of detection sensors, the determination unit can receive a plurality of detection information without fluctuation due to a shift in detection timing. Therefore, the determination unit can appropriately determine the state of the sheet based on the plurality of detection information.

  Furthermore, since the number of receiving ports is only one, the determination unit can be configured with a relatively simple configuration with a small number of components (for example, a small number of connector pins), thereby reducing the manufacturing cost of the determination unit. In addition, the determination unit can be downsized. In addition, the number of harnesses for connecting between the plurality of detection sensors and the reception port can be reduced.

In the invention according to claim 2, the timing at which the plurality of detection sensors respectively transmit the detection information is set in advance with reference to the timing at which the information request signal is received from the transmission port. Therefore, each detection sensor transmits detection information at different timings with reference to the timing at which all the detection sensors receive the information request signal at the same time. Therefore, the determination unit does not need to individually transmit information request signals to the detection sensors at different timings. The determination unit need only be a simple communication that transmits an information request signal once. In addition, in the inventions according to the first and second aspects, since the sample hold signal is transmitted from the single transmission port to the plurality of detection sensors, the plurality of pieces of detection information detected at the same timing are received by the single reception. Can be received at the port.

It is the figure which looked at the vehicle provided with the vehicle seat state determination apparatus which concerns on Example 1 of this invention from the side. It is a block block diagram of the vehicle seat state determination apparatus shown by FIG. It is a control flow of the determination part shown by FIG. FIG. 4 is a time chart showing a temporal relationship between a signal transmitted by a transmission port and a signal received by a reception port in accordance with execution of the control flow shown in FIG. 3. It is a control flow of the determination part which concerns on Example 2 of this invention. 6 is a time chart illustrating a temporal relationship between a signal transmitted by a transmission port and a signal received by a reception port in accordance with execution of the control flow illustrated in FIG. 5.

  EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated below based on an accompanying drawing.

An example of a vehicle including the vehicle seat state determination device according to the first embodiment will be described with reference to FIGS.
FIG. 1 illustrates the seat 20, the seat belt device 30, and the airbag device 40 provided in the vehicle 10 as viewed from the side. Further, the seat 20 is illustrated as a passenger seat on which the occupant Mn sits.

  The seat 20 includes a seat cushion 21, a seat back 22, and a headrest 23. The seat cushion 21 is mounted on a seat support frame 24 fixed to the floor 12 of the vehicle body 11.

  The seat belt device 30 restrains an occupant Mn seated on the seat 20 with a belt 31 (also referred to as a seat belt or webbing). According to the seat belt device 30, the belt 31 that simultaneously restrains one shoulder and waist of the occupant Mn can be wound up by a retractor (not shown). The seat belt device 30 has a three-point support structure in which the belt 31 is supported by three anchors, that is, an upper anchor 32, a center anchor 33, and a lower anchor (not shown).

  The airbag device 40 includes an airbag module 41 disposed inside the dashboard 13 and an airbag controller 42 that controls the airbag module 41. The airbag module 41 is stored in a retainer in a state in which the airbag 43 is folded. For example, when the vehicle 10 collides with an obstacle ahead, the airbag control unit 42 receives a signal from a collision detection sensor (not shown) and issues a bag deployment control signal to the airbag module 41.

  The airbag module 41 that has received the bag deployment control signal from the airbag controller 42 causes the inflator to generate gas to inflate the airbag 43 and deploy it in the passenger compartment 14, and further to the upper body of the passenger Mn. Deploy in the vicinity. As a result, the occupant Mn seated on the seat 20 (passenger seat) can be protected by the airbag 43.

  As shown in FIGS. 1 and 2, the vehicle 10 includes a vehicle seat state determination device 50. The vehicle seat state determination device 50 includes a plurality of (for example, four) detection sensors 60 </ b> A to 60 </ b> D and one determination unit 70.

  The plurality of detection sensors 60 </ b> A to 60 </ b> D individually detect information related to the seat 20, and include, for example, load sensors for detecting a load acting on the seat cushion 21. The plurality of detection sensors 60 </ b> A to 60 </ b> D are disposed, for example, between the seat cushion 21 and the seat support frame 24, and are positioned at the four front, rear, left, and right corners when the seat cushion 21 is viewed from above. For this reason, the weight of the occupant Mn seated on the seat cushion 21 and the weight of a luggage placed on the seat cushion 21 can be detected by the plurality of detection sensors 60A to 60D. The sitting posture of the occupant Mn can change frequently. In order to always detect an appropriate value corresponding to this change, the seat cushion 21 is provided with a plurality of detection sensors 60A to 60D, and the sum of the detection sensors 60A to 60D is obtained.

  Here, the detection sensor 60A located on the right front side of the seat cushion 21 is referred to as “first detection sensor 60A”, the detection sensor 60B located on the left front side of the seat cushion 21 is referred to as “second detection sensor 60B”, and the seat The detection sensor 60C positioned to the right of the cushion 21 is referred to as a “third detection sensor 60C”, and the detection sensor 60D positioned to the left of the seat cushion 21 is referred to as a “fourth detection sensor 60D”.

  Each of the detection sensors 60A to 60D includes a detection unit 61, a storage unit 62, and a signal processing unit 63, respectively. The detection part 61 is a detection part which detects the load (information regarding the sheet | seat 20) which acts on the seat cushion 21, Comprising: For example, it is comprised by the strain gauge. The storage unit 62 is a part that stores information (detection information) on the load detected by the detection unit 61. The signal processing unit 63 reads the detection information stored in the storage unit 62 and reads out the detection information stored in the storage unit 62 and the function of issuing a detection command to the detection unit 61. Output function.

The determination unit 70 includes a determination unit 71 and a diode 72. The determination unit 71 determines the state of the seat 20 based on each detection information detected by the plurality of detection sensors 60A to 60D, and issues a determination result to the airbag control unit 42, for example. The determination unit 71 has, for example, a microcomputer, and a single transmit port P _T and a single receive port P _R.

The transmission port _PT is a port for the determination unit 71 to transmit an information request signal for requesting each detection information to all of the plurality of detection sensors 60A to 60D. The transmission port _PT is connected to each signal processing unit 63 of all the detection sensors 60A to 60D via a backflow prevention diode 72 and a signal line 73. The diode 72 allows unidirectional communication only by transmitting from the transmission port _PT to each of the detection sensors 60A to 60D.

Reception port P _R, a plurality of detection sensors 60A~60D uttered respectively in response to the information request signal of the determination unit 71 is a port for receiving the respective detection information. The reception port _{P R} via the signal line 73 is connected to the signal processing units 63 of all the sensor 6OA to 6OD.

  Next, a control flow when the determination unit 71 is a microcomputer will be described based on FIG. 3 with reference to FIGS.

  FIG. 3 shows a control flowchart of an example of sheet state determination control executed by the determination unit 71 (see FIG. 2).

First, in step ST01, the determination unit 71 transmits a sample hold signal to all the detection sensors 60A to 60D. Specifically, the determination unit 71 transmits a sample hold signal from the transmission port _PT to the signal processing units 63 of all the detection sensors 60A to 60D via the diode 72 and the signal line 73. Here, the sample hold signal is a request signal for detecting and storing information relating to the sheet 20.

  Each signal processing unit 63 that has received the sample hold signal issues a detection command to the corresponding detection unit 61. Each detection unit 61 individually detects information (load information) related to the sheet 20. Information detected by each detection unit 61, that is, detection information is individually stored in the corresponding storage unit 62. As described above, all the detection sensors 60A to 60D individually detect and store information on the sheet 20 at the same timing. Each detection information does not change due to a detection timing shift. That is, so-called simultaneity of a plurality of pieces of detection information can be ensured.

In the next step ST02, the determination unit 71 transmits an information request signal to the first detection sensor 60A. Specifically, the determination unit 71 transmits an information request signal from the transmission port to the signal processing unit 63 of the first detection sensor 60A via the diode 72 and the signal line 73 from _PT . Here, the information request signal is a request signal for requesting information (detection information) related to the sheet 20 stored in the storage unit 62.

The signal processing unit 63 of the first detection sensor 60 </ b> A that has received this information request signal reads the detection information stored in the corresponding storage unit 62, forms it into a predetermined transmission format, and passes through the signal line 73. to the receiving port _{P R} of the determination unit 71.

  The determination unit 71 determines whether or not the detection information from the first detection sensor 60A is received in the next step ST03. In step ST03, if it is determined that the detection information transmitted from the first detection sensor 60A has been received, the process proceeds to the next step ST04. If it is determined that it has not been received, Step ST03 is repeated. In this way, the detection information of the first detection sensor 60A can be reliably received.

In the next step ST04, the determination unit 71 performs the same process as in step ST02 on the second detection sensor 60B. That is, an information request signal is transmitted to the second detection sensor 60B. The signal processing unit 63 of the second detection sensor 60B that has received this information request signal reads the detection information stored in the corresponding storage unit 62, and receives the reception port P of the determination unit 71 via the signal line 73. _{To R.}

  In the next step ST05, the determination unit 71 executes the same process as in step ST03. That is, it is determined whether detection information from the second detection sensor 60B has been received. If it is determined that the detection information has been received, the process proceeds to the next step ST06. If it is determined that the detection information has not been received, step ST05 is repeated until it is received.

In the next step ST06, the determination unit 71 performs the same process as in step ST02 on the third detection sensor 60C. That is, an information request signal is transmitted to the third detection sensor 60C. The signal processing unit 63 of the third detection sensor 60C that has received this information request signal reads the detection information stored in the corresponding storage unit 62, and receives the reception port P of the determination unit 71 via the signal line 73. _{To R.}

  In the next step ST07, the determination unit 71 executes the same process as in step ST03. That is, it is determined whether the detection information from the third detection sensor 60C has been received. If it is determined that the detection information has been received, the process proceeds to the next step ST08. If it is determined that the detection information has not been received, step ST07 is repeated until it is received.

In the next step ST08, the determination unit 71 performs the same process as in step ST02 on the fourth detection sensor 60D. That is, an information request signal is transmitted to the fourth detection sensor 60D. The signal processing unit 63 of the fourth detection sensor 60D that has received this information request signal reads the detection information stored in the corresponding storage unit 62, and receives the reception port P of the determination unit 71 via the signal line 73. _{To R.}

  In the next step ST09, the determination unit 71 executes the same process as in step ST03. That is, it is determined whether or not the detection information from the fourth detection sensor 60D has been received. If it is determined that the detection information has been received, the process proceeds to the next step ST10. If it is determined that the detection information has not been received, step ST09 is repeated until it is received.

  In the next step ST10, the determination unit 71 calculates the sum of the pieces of detection information received from all the detection sensors 60A to 60D, that is, the total load acting on the seat cushion 21.

  In the next step ST <b> 11, the determination unit 71 determines the state of the sheet 20 based on the total sum of the pieces of detection information, and then ends the control by this control flow. That is, the state of the seat 20 is determined based on the detection information detected by the plurality of detection sensors 60 </ b> A to 60 </ b> D, and the determination result is transmitted to the airbag control unit 42. For example, it is determined whether an adult or a child is seated on the seat 20 or a luggage is placed on the seat 20 according to the magnitude of the total load acting on the seat cushion 21.

  The airbag control unit 42 controls the operation of the airbag module 41 shown in FIG. 1 based on the determination result of the determination unit 71. For example, when a determination result that an adult is seated on the seat 20 is obtained, the airbag control unit 42 issues a bag deployment permission control signal to the airbag module 41, so that the airbag 43 is assigned to the occupant Mn. Permits expansion and deployment near the upper body. On the other hand, if the result of determination that a child is seated on the seat 20 or that a load is placed on the seat 20 is obtained, the airbag control unit 42 sends a bag deployment prohibition control signal to the airbag module 41. By firing, the airbag 43 is prohibited from being deployed. In this way, the airbag control unit 42 can perform control according to information regarding the state of the seat 20.

FIG. 4 shows the temporal relationship between the signal transmitted by the transmission port P _T (see FIG. 2) and the signal received by the reception port P _R (see FIG. 2) in accordance with the execution of the control flow shown in FIG. It is a time chart which shows a relationship. Each step shown in FIG. 3 and the time chart shown in FIG.

  Note that the time difference between the transmission / reception timing of each of the detection sensors 60A to 60D and the transmission / reception timing of the determination unit 71 is a minute time. Therefore, in the communication between each of the detection sensors 60A to 60D and the determination unit 71, the timing when one transmission is completed and the timing when the other reception is completed are assumed to be the same as below.

First, at time t1, step ST01 transmits a sample hold signal to all the detection sensors 60A to 60D.
Next, at time t2, step ST02 starts transmission of an information request signal to the first detection sensor 60A. At the time t3 when a minute time has elapsed from the time t2, the transmission of the information request signal from the determination unit 71 is completed, and the reception of the information request signal is also completed by the first detection sensor 60A.
In the determination unit 71, immediately after the transmission of the information request signal is completed, step ST03 determines whether or not the detection information from the first detection sensor 60A has been received. Immediately after the completion of reception of the information request signal by the first detection sensor 60A, the first detection sensor 60A transmits the detection information to the determination unit 71. At the same time, the determination unit 71 completes reception of the detection information.

  Immediately after determining that the reception of the detection information is completed in step ST03, step ST04 starts transmitting an information request signal to the second detection sensor 60B in the same manner as in step ST02. The transmission / reception of the information request signal is completed at time t6 when a minute time has elapsed from time t5. The second detection sensor 60B transmits detection information to the determination unit 71 at time t7 immediately after the transmission / reception is completed. At the same time, the determination unit 71 completes reception of the detection information.

  Immediately after determining that the reception of the detection information is completed in step ST05, step ST06 starts transmitting an information request signal to the third detection sensor 60C as in step ST02. Transmission and reception of the information request signal is completed at time t9 when a minute time has elapsed from time t8. The third detection sensor 60C transmits the detection information to the determination unit 71 at time t10 immediately after the transmission / reception is completed. At the same time, the determination unit 71 completes reception of the detection information.

  At time t11 immediately after step ST07 determines that reception of the detection information has been completed, step ST08 starts transmitting an information request signal to the fourth detection sensor 60D, similar to step ST02. The transmission / reception of the information request signal is completed at time t12 when a minute time has elapsed from time t11. The fourth detection sensor 60 </ b> D transmits detection information to the determination unit 71 at time t <b> 13 immediately after the transmission / reception is completed. At the same time, the determination unit 71 completes reception of the detection information.

The first embodiment having the above configuration exhibits the following effects.
The plurality of detection sensors 60 </ b> A to 60 </ b> D individually detect and store information regarding the sheet 20 at the same timing, and each of the stored detection information is responded to an information request signal from the determination unit 71. , And transmitted to the determination unit 71 at different timings.

As described above, the plurality of detection sensors 60A to 60D respectively detect information on the sheet 20 at the same detection timing. For this reason, each detection information does not change due to a shift in detection timing. That is, so-called simultaneity of a plurality of pieces of detection information can be ensured. On the other hand, the receiving port P _R Since receives a plurality of the detection information at different timings, it is sufficient only one. Moreover, the reception port P _R is a plurality of detection information detected at the same timing, since only sequentially receives, in each of the detection information, there is no variation accompanying displacement of the detection timing. For a plurality of detection sensors 6OA to 6OD, despite receiving port P _R is only one, the determination unit 71 a plurality of detection information, that variation due to the shift of the detection timing without receiving it can. Therefore, the determination unit 71 can appropriately determine the state of the sheet 20 based on the plurality of detection information.

Furthermore, since the number of reception ports P _R is only one, with a small part of the determination unit 71 (e.g., less connector pins), and can be a relatively simple configuration, as a result, the manufacturing cost of the determination unit 71 In addition, the determination unit 71 can be downsized. Moreover, it is possible to reduce a plurality of detection sensors 60A~60D for connecting between the reception port P _R, the number of harnesses.

  Next, an example of a vehicle including the vehicle seat state determination device according to the second embodiment will be described with reference to FIGS. 5 and 6. In addition, the vehicle seat state determination device 10 according to the second embodiment is characterized in that the content of the seat state determination control executed by the determination unit 71 is changed to the control flowchart shown in FIG. Since it is the same as the structure shown in FIGS. 1-2, description is abbreviate | omitted.

  FIG. 5 shows a control flowchart of an example of sheet state determination control according to the second embodiment, which is executed by the determination unit 71 (see FIG. 2).

First, in step ST21, the determination unit 71 transmits a sample hold signal from the transmission port _PT to all the detection sensors 60A to 60D via the diode 72 and the signal line 73. That is, the same control as step ST01 shown in FIG. 3 is executed. All the detection sensors 60A to 60D that have received the sample hold signal individually detect and store information on the sheet 20 at the same timing.

In the next step ST22, the determination unit 71 transmits an information request signal from the transmission port _PT to all the detection sensors 60A to 60D via the diode 72 and the signal line 73. Receiving this information request signal, each of the detection sensors 60A to 60D reads the detection information stored in the corresponding storage unit 62, and sequentially receives the detection port of the determination unit 71 via the signal line 73 at a predetermined timing. to send to the P _R. The timing at which the detection sensors 60A to 60D sequentially transmit the detection information is set in advance.

  In the next step ST23, the determination unit 71 receives detection information from the first detection sensor 60A. Next, in step ST24, detection information from the second detection sensor 60B is received, then in step ST25, detection information from the third detection sensor 60C is received, and then in step ST26, from the fourth detection sensor 60D. Receive detection information.

  In the next step ST27, the determination unit 71 calculates the sum of the pieces of detection information received from all the detection sensors 60A to 60D, that is, the total load acting on the seat cushion 21.

  In the next step ST <b> 28, the determination unit 71 determines the state of the sheet 20 based on the sum of the pieces of detection information, and then ends the control according to this control flow. That is, the state of the seat 20 is determined based on the detection information detected by the plurality of detection sensors 60 </ b> A to 60 </ b> D, and the determination result is transmitted to the airbag control unit 42.

  As described above, the determination unit 71 according to the second embodiment does not individually transmit the information request signal to each of the detection sensors 60A to 60D, but transmits the information request signal to all the detection sensors 60A to 60D all at once. To do.

FIG. 6 shows the temporal relationship between the signal transmitted by the transmission port P _T (see FIG. 2) and the signal received by the reception port P _R (see FIG. 2) in accordance with the execution of the control flow shown in FIG. It is a time chart which shows a relationship. Each step shown in FIG. 5 will be described below in association with the time chart shown in FIG.

  Note that the time difference between the transmission / reception timing of each of the detection sensors 60A to 60D and the transmission / reception timing of the determination unit 71 is a minute time. Therefore, in the communication between each of the detection sensors 60A to 60D and the determination unit 71, the timing when one transmission is completed and the timing when the other reception is completed are assumed to be the same as below.

First, at time t21, step ST21 transmits a sample hold signal to all the detection sensors 60A to 60D.
Next, at time t22, step ST22 starts transmitting information request signals to all the detection sensors 60A to 60D. At the time t23 when a minute time has elapsed from the time t22, the transmission of the information request signal from the determination unit 71 is completed, and the reception of the information request signal is also completed in all the detection sensors 60A to 60D.
At this time, it is also possible to include a sample hold signal in the information request signal. In this case, step ST21 can be omitted.

  The timings t24, t25, t26, and t27 at which the detection sensors 60A to 60D transmit the detection information are set in advance so as to be based on the time t23 when the detection sensors 60A to 60D complete the reception of the information request signal. Yes.

That is, the first detection sensor 60A transmits the detection information to the determination unit 71 at time t24 when a certain time T1 has elapsed from time t23. At the same time, the determination unit 71 completes reception of the detection information.
The second detection sensor 60B transmits the detection information to the determination unit 71 at time t25 when a certain time T2 has elapsed from time t23. At the same time, the determination unit 71 completes reception of the detection information.
The third detection sensor 60C transmits the detection information to the determination unit 71 at time t26 when a certain time T3 has elapsed from time t23. At the same time, the determination unit 71 completes reception of the detection information.
The fourth detection sensor 60D transmits the detection information to the determination unit 71 at time t27 when a certain time T4 has elapsed from time t23. At the same time, the determination unit 71 completes reception of the detection information.

  About the length of each time T1-T4, it is set to the relationship of "T1 <T2 <T3 <T4". Time t24 is a time when a minute time has passed since time t23 when the first detection sensor 60A completed reception of the information request signal. The time point t25 is a time point after the determination unit 71 completes reception of the detection information from the first detection sensor 60A. The time point t26 is a time point after the determination unit 71 completes reception of the detection information from the second detection sensor 60B. The time point t27 is a time point after the determination unit 71 completes reception of the detection information from the third detection sensor 60C.

In addition to the effects of the first embodiment, the second embodiment having the above configuration exhibits the following effects.
That is, in the second embodiment, the timings t24, t25, t26, and t27 at which the plurality of detection sensors 60A to 60D each transmit the detection information are preliminarily based on the timing t23 that receives the information request signal from the transmission port _PT. Is set. For this reason, each of the detection sensors 60A to 60D receives the detection information at different timings t24, t25, t26, and t27 based on the timing t23 at which all the detection sensors 60A to 60D simultaneously receive the information request signal. Send. Therefore, the determination unit 71 does not need to individually transmit information request signals to the detection sensors 60A to 60D at different timings. The determination unit 71 can be simply communicated by transmitting an information request signal once.

In the present invention, the plurality of detection sensors 60 </ b> A to 60 </ b> D may be any sensors that detect information related to the seat 20, and are not limited to those that detect a load acting on the seat cushion 21.
Moreover, the determination part 71 should just be what determines the state of the sheet | seat 20. FIG.

  The vehicle seat state determination device 50 of the present invention is suitable for use in determining the state of a passenger seat of an automobile.

10 ... vehicle, 20 ... seat, 50 ... seat state determining apparatus for a vehicle, 6OA to 6OD ... plurality of detection sensors, 71 ... determining unit, P T _... transmission port, P R _... receiving port.

Claims (3)

A vehicle seat state comprising: a plurality of detection sensors that individually detect information related to a vehicle seat; and a determination unit that determines the state of the seat based on each detection information detected by the plurality of detection sensors. In the judgment device,
The determination unit
For all of the plurality of detection sensors, the sample-hold signal requesting detected at the same timing as for transmitting the information request signal for requesting the detected information of said each of a single transmission port,
A single receiving port for receiving each of the detection information issued by each of the plurality of detection sensors in response to the information request signal;
The single transmission port transmits each of the information request signals to the plurality of detection sensors at different timings so that the information request signal is transmitted to a corresponding one of the plurality of detection sensors. While sending to
Said plurality of detection sensors, storing each of said detection information detected individually by the same timing to each other, said each of the detection information that the storage, directly in response to the information request signal, different from each other A vehicle seat state determination device, wherein the vehicle seat state determination device transmits the signal to the single reception port at a timing. A vehicle seat state comprising: a plurality of detection sensors that individually detect information related to a vehicle seat; and a determination unit that determines the state of the seat based on each detection information detected by the plurality of detection sensors. In the judgment device,
The determination unit
A single transmission port for transmitting a sample hold signal for requesting detection at the same timing and an information request signal for requesting each detection information to all of the plurality of detection sensors;
A single receiving port for receiving each of the detection information issued by each of the plurality of detection sensors in response to the information request signal;
The single transmission port transmits a single information request signal to the plurality of detection sensors at a predetermined timing so as to transmit the information request signal to all of the plurality of detection sensors all at once. ,
The plurality of detection sensors store the respective detection information individually detected at the same timing, and the respective detection information stored in the plurality of detection sensors are different from each other in response to the information request signal sequentially. Transmitting to the single receiving port at the timing,
The different timings of each of the plurality of detecting sensors each transmit a detection information of the each, based on the predetermined timing which received the information request signal, and characterized in that it is set in advance, respectively car dual-purpose sheet state determination device. The single transmission port is connected to the plurality of detection sensors via a diode and a communication signal line that allow unidirectional transmission from the single transmission port to the plurality of detection sensors.
The vehicle seat state determination device according to claim 1 or 2, wherein the single reception port is connected to the plurality of detection sensors via the communication signal line.

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