JP3985532B2 - On-seat object determination device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-sheet object determination device that detects an object such as a person or an object on a sheet.
[0002]
[Prior art]
In recent years, in vehicles, various measures have been taken on vehicles to ensure the safety of passengers in traffic accidents. For example, in order to ensure safety for passengers at the time of a vehicle collision, mounting of an airbag device on a vehicle is rapidly spreading. The airbag device detects an impact generated in the vehicle at the time of a vehicle collision by an acceleration sensor or the like, and based on a signal from the acceleration sensor, the airbag device is disposed in the center of the steering wheel or in the dash panel of the passenger seat. Drive signal. Thereafter, the inflator housed in the airbag device is ignited to explode the inflator. The gas generated by the explosion instantly inflates the airbag stored in the center of the steering wheel or in the dash panel of the passenger seat, thereby protecting the passenger sitting in the front row of the vehicle. .
[0003]
By the way, when the child is seated directly on the passenger seat in the front row of the vehicle or the child (especially an infant) is seated on the child restraint device called a child seat. There can be. In such a case, it is necessary to control so as to increase or decrease the amount of inflation of the airbag from the viewpoint of safety.
[0004]
As an air bag apparatus having such control, there is one disclosed in, for example, Japanese Patent Laid-Open No. 9-207638. In this apparatus, first, four load sensors are provided in a seat attachment portion for attaching a seat to a floor, and a detected load value is calculated based on sensor values detected by the four load sensors. The state of the object on the seat is classified based on the detected load value and the preset load value, and the airbag drive circuit is controlled.
[0005]
However, the above apparatus has the following problems. The procedure for mounting the child restraint device (child seat) on the seat is that the wearer lightly secures the child restraint device with the seat belt, then presses the child restraint device against the seat and tightens the seat belt. do. Therefore, there may be a case where the state data is classified as adult seating due to the increase in load.
[0006]
The following methods can be considered as countermeasures against this problem. Normally, even when the load increases due to the tightening operation of the seat belt, the wearer releases the press-down after the tightening is completed, and the load decreases by a predetermined amount. Using this characteristic, that is, using the increase / decrease of the load after the seat belt is attached as an index, a method of determining whether or not the child restraint device is attached can be considered. This method was shown in Japanese Patent Application No. 2000-377607.
[0007]
However, even in the case of the above-described device, if the child restraint device is installed and classified as status data, and the status data is simply stored in the memory inside the CPU, the following problems occur. That is, when the memory inside the CPU is reset for some reason, the memory is cleared or changed, and its state data is different. In this case, in order to distinguish again whether the child restraint device is mounted as the state data, the above-described increase / decrease change in the load is required. In other words, if the child restraint device is continuously mounted without performing the mounting operation again, there is a possibility that the wrong state data is continuously stored and erroneous determination is performed based on the stored state data. This is because if there is no change in the load and the load is simply used as an index, the child restraint device wearing state may be regarded as an adult sitting state due to an increase in the load due to the seat belt tightening as described above. Because it is expensive.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to improve the reliability of the determination result of an object on a sheet even when an abnormality occurs.
[0009]
[Means for Solving the Problems]
  The technical means taken in order to solve the above-mentioned problems include a load detection means for detecting a load acting on the seat, and the load detection means.ofBased on load sizeBeforeSitting adults and children on the sheetAnd from the load detection meansBased on load changeBeforeState of wearing restraint device for children on sheetDetermine the stateClassify the segmented state dataState memoryAnd an on-seat object determination device comprising a control means for storingThe state storage memory includes a plurality of memory areas, and the control means includes a non-volatile memory that stores state data indicating whether or not the child restraint device is mounted even when power is not supplied. When determining the state, the state data having the same contents are stored in the plurality of memory areas, respectively, and when the child restraint device is detected to be mounted, the state of whether or not the child restraint device is mounted is determined. When the power is first supplied to the control means or when the control means is reset, the plurality of memory areas are stored according to the state data stored in the nonvolatile memory. When the state data is substituted, and the state data of at least two of the plurality of memory areas match, the matched state The object on the sheet is determined based on the data, and when the state data stored in the plurality of memory areas do not match, the object on the sheet is determined based on the state data stored in the nonvolatile memory. judgeThis is what I did.
[0010]
  According to the above means,Determination of seating for adults and children is made based on the magnitude of the load from the load detection means. Judgment of mounting of the child restraint device on the seat is performed based on a load change from the load detection means. From these determinations, an adult seating, a child seating, and a state in which a child restraint device is worn are classified. This state is stored in each of a plurality of memory areas in the state storage memory, and the state where the child restraint device is attached or not is stored in the nonvolatile memory. The control means compares the state data stored in the plurality of memory areas. When the state data in at least two of the memory areas match, the object on the sheet is determined based on the matched state data. When the state data stored in the plurality of memory areas do not match, the object on the sheet is determined based on the state data stored in the nonvolatile memory. Also, based on the state data stored in the non-volatile memory when power is first supplied to the control means or when the control means is reset. The state storage memory is returned. Thus, when the state data stored in the plurality of memory areas of the state storage memory do not match, when the power is first supplied to the control means, or when the control means is reset, the load change occurs. Even if it does not happen, it is possible to determine whether or not the child restraint device is mounted. In addition, if the child restraint device is not installed, the seating of adults and children can be judged based on the magnitude of the load. There is no. Therefore, the reliability of the determination result can be improved.
[0011]
Further, the technical means taken to solve the above-described problem is that, in the technical means, when the state data stored in the plurality of memory areas of the state storage memory do not match, the nonvolatile memory When the state is a child restraint device attachment determination, the state of the child restraint device attachment determination is stored in the state storage memory, and the state of the non-volatile memory is determined without the child restraint device attachment determination. When there is, the state of no occupant is stored in the state storage memory.
[0012]
According to the above means, the control means can determine the object on the sheet based on the state storage memory.
[0013]
Further, the control means can control the output of the airbag device to be variable based on a reliable determination result if the airbag device is operated with the output being variable based on the determination result of the object on the seat. Thus, the safety of the airbag device is improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a perspective view of a seat body 1 of a vehicle seat (simply referred to as a seat). A seat body 1 shown in FIG. 1 is provided, for example, in a front row (passenger seat) of a vehicle, and a left and right support frame 2 that points to the seat body 1 is fixed in the front-rear direction (x direction) with respect to the vehicle floor. The
[0016]
On the upper surface of each support frame 2, a lower rail 4 is fixed along the support frame 2 with respect to the pair of front and rear brackets 3. The pair of left and right lower rails 4 has a U-shaped cross section, and an upper part thereof is open, and the opening forms a slide groove 5 extending in the front-rear direction.
[0017]
A pair of left and right upper rails 6 is slidably disposed in the front and rear direction along the slide groove 5 in the slide groove 5 formed in each lower rail 4. The left and right upper rails 6 are connected to a lower arm 16 that supports the seat cushion 9 and the seat back 10 of the seat body 1 via a pair of left and right sensor brackets 7 and 8 shown in FIG.
[0018]
A sensor bracket 7 on the front side of the seat body 1 has an upper fastening portion 7a and a lower fastening portion 7b at both upper and lower ends, and a bending portion 7c having a curved center is formed. The front sensor bracket 7 has upper and lower fastening portions 7 a and 7 b connected to the lower arm 16 and the front side portion of the upper rail 6, respectively. Then, a front right (FR) load sensor 21 and a front left (FL) load sensor 22 constituting a load sensor are attached to the bent portions 7c of the right and left front sensor brackets 7 by adhesion or the like. These sensors 21 and 22 are composed of strain detecting elements such as strain gauges, for example, and the bending portion 7c bends with respect to the load acting on the seat cushion 9 that supports the seating surface, and can detect the amount of bending according to the load. .
[0019]
On the other hand, the sensor bracket 8 on the rear side shown in FIG. 1 also has an upper fastening portion 8a and a lower fastening portion 8b at both upper and lower ends, and the bent portion 8c is bent between the upper and lower fastening portions 8a and 8b. Is formed. The rear sensor bracket 8 is connected to the lower arm 16 and the rear side portion of the upper rail 6 at the upper and lower fastening portions 8a and 8b. The rear right side (RR) load sensor 23 and the rear left side (RL) load sensor 24 constituting the load sensor are respectively connected to the flexible portion 8c of the right side and left side rear sensor bracket 8, the FR load sensor 21 and the FL load. Similar to the sensor 22, the sensor 22 is composed of, for example, a strain detection element such as a strain gauge, and can be deflected with respect to the load applied to the seat cushion 9 and the amount of deflection can be detected.
[0020]
The upper rail 6 on one side (left side in FIG. 1) of the seat body 1 has an anchor bracket 13 provided with a belt anchor 12 at the front end for connecting and fixing a seat belt 11 extending from the vehicle to the seat body 1. Connected.
[0021]
Next, an on-seat object determination device (referred to as “this device”) 20 is installed in the front portion of the vehicle (for example, at the center of the steering wheel in the driver's seat and above the instrument panel in the passenger seat). The system configuration of the airbag control device when applied to an airbag control device that variably operates the inflation amount of the airbag will be described with reference to FIG.
[0022]
The airbag control device performs load sensor 21 to 24 provided at a predetermined position of the seat body 1 described above, a seat belt switch 12a provided in the seat belt anchor 12, and a state detection on the seat, and the airbag device 30. And a controller 25 for issuing an output command to the computer.
[0023]
The seat belt switch 12 a is turned on when the seat belt 11 is attached to the belt anchor 12, and is turned off when the seat belt 11 is not attached to the belt anchor 12. The detection signal from the seat belt switch 12a is input to the controller 25, and the controller 25 can detect the wearing state of the seat belt 11 based on the state of the detection signal.
[0024]
The controller 25 is a non-volatile memory that retains and stores the stored state even when power is not supplied to the CPU 26, the power supply circuit 19, the sensor signal input circuit 27, the determination output circuit 28, and the controller 25 that controls the control. And an EEPROM 29 of a memory.
[0025]
Among these, the sensor signal input circuit 27 includes active filters 27a, 27b, 27c, and 27d to which signals detected from the FR load sensor 21, the FL load sensor 22, the RR load sensor 24, and the RL load sensor 24 are input. Have individually. The load signals of these load sensors 21 to 24 are input to the CPU 26 via the active filters 27a to 27d. The active filters 27a to 27d are well-known low-pass filters in which an active element such as an amplifier is combined with a passive element composed of a capacitor and a resistor. The active filters 27a to 27d pass only low frequency signals among the load signals from the load sensors 21 to 24.
[0026]
Based on the load signals from the FR load sensor 21 and the FL load sensor 22 that have passed through the active filters 27a and 27b, the load detection values FR and FL for each of the load sensors 21 and 22 are calculated by the CPU 26. Further, based on the load signals from the RR load sensor 23 and the RL load sensor 24 that have passed through the active filters 27c and 27d, the load detection values RR and RL for the load sensors 23 and 24 are calculated by the CPU 26. Then, the total load detection value S as the load detection value is calculated by summing up these load detection chins FR to RL.
[0027]
The CPU 26 performs arithmetic processing according to a predetermined program stored in advance, and outputs the result to the determination output circuit 28. The airbag device 30 is controlled by outputting it to the airbag device (A / B ECU) 30 via the determination output circuit 28.
[0028]
In the system having such a configuration, a child restraint device (CRS) 31 called a child seat is attached to the seat body 1. The CRS 31 is normally fixed to the seat body 1 by the seat belt 11 as indicated by a two-dot chain line shown in FIG. 1 and is in the following state when the CRS is attached.
[0029]
That is, when the CRS 31 is mounted on the seat cushion 9 of the seat body 1 and the seating surface of the seat back 10, the CRS 1 is first placed on the seat cushion. At this time, since the CRS 31 weighs several kilograms and is lighter than the weight of an adult, the total load detection value S is also a relatively small value. Then, the seat belt 11 is passed through the seat belt mounting hole on the back portion of the CRS 31, the seat belt 11 is attached to the belt anchor 12, and the CRS 31 is temporarily fixed. In this case, since the seat belt 11 has not yet been tightened to firmly fix the CRS 31 to the seat body 1, the total load detection value S is a relatively small value. The above-mentioned tendency is similarly applied when a child is seated on the seat body 1.
[0030]
After that, in order to firmly fix the CRS 31 to the seat body 1, the CRS 31 is weighted and pressed, the seat belt 11 is fastened, the CRS 31 is securely fixed to the seat body 1, and the CRS 31 is attached. finish. When this CRS is mounted, the total load detection value S is significantly reduced. As described above, by detecting the characteristic of the total load detection value S, it is possible to determine whether or not the CRS 31 is mounted based on the load change amount at the time of mounting.
[0031]
The control performed by the CPU 26 will be described with reference to the flowchart shown in FIG. In the following description of the flowchart, the steps of the program are simply described as “S”.
[0032]
When power is first supplied from the battery to the CPU 26 or when the CPU 26 is reset, the processing from S101 is executed. First, in S101, the CPU 26 checks whether the memory (RAM) in the CPU can store data normally, and then in S102, assigns initial values necessary in advance when executing the following control processing. Set the value. Then, in S103, the CPU 26 performs a system check as to whether or not the airbag control device including the controller 25 and the airbag device 30 operates normally, and ends the initial processing from S101 to S103.
[0033]
Thereafter, the CPU 26 checks the CRS determination area for storing whether or not the CRS mounting state is detected in the nonvolatile memory (EEPROM) 29 for storing the state even when the power is not supplied to the controller 25. Here, when the attachment of the CRS 31 is not detected, the initial value is set to “0: CRS determination is not yet performed” in the memory (for example, the state storage memory) in the CPU in the initial value setting in S102. "Indicates state" is substituted.
[0034]
In S104, if the CRS determination area of the EEPROM 29 is not yet formed (for example, “0” state), “1: No occupant” is substituted as the state data in the state storage memory inside the CPU in S105. After that, the process proceeds to S107. On the other hand, if the CRS determination has already been made (the state where the CRS determination area is “1”), “4: CRS determination already exists” is substituted as the state data in the state storage memory inside the CPU in S106. Then, the process proceeds to S107. That is, in the processing up to S106, referring to the data in the CRS determination area of the EEPROM 29, "0: CRS determination is not yet performed" is substituted for the initial value in the CRS determination area. Is detected by the CPU 26, the value "4" is substituted into the CRS determination area.
[0035]
After that, in S107, the total load detection value based on the load detection values FR, FL, RR, RL of the FR, FL, RR, RL load sensors 21, 22, 23, 24 filtered by the sensor signal input circuit 27. S is calculated, and the calculation result is stored in a predetermined memory area in the CPU.
[0036]
Next, in S108, it is determined whether or not the seat belt 11 is mounted on the seat. In this determination, the CPU 26 determines that the seat belt 11 is attached when the seat belt switch 12a is on, and the CPU 26 determines that no belt is attached when the seat belt switch 12a is off.
[0037]
Here, when it is determined that the seat belt 11 is mounted on the seat, in S109 and after, processing for classifying states is performed based on the load detection values of the load sensors 21 to 24 and the amount of change in the load detection values. First, in S109, it is determined whether the total load detection value S0 when the seat belt is worn is equal to or less than a predetermined value A. The total load detection value S0 when the seat belt is worn is the value of the total load detection value S at the timing when the detection signal from the seat belt switch 12a is switched from OFF to ON. The total load detection value S0 is Even if the power is turned off and power is not supplied to the controller 25, the data is stored in the EEPROM 29 so that the storage state can be maintained.
[0038]
That is, the total load detection value S is an adult-like load on the seat cushion when the seat belt 11 is detected when an adult is seated on the seat body 1. The total load detection value S0 also becomes a large value to some extent.
[0039]
On the other hand, when the child is seated on the seat body 1 and the CRS is temporarily fixed, the total load detection value S of the child and the CRS 31 is smaller than that of the adult, and therefore the total load detection value when the seat belt is worn. S also decreases. For this reason, the predetermined value A for determination is set to a value that distinguishes between the state in which the adult is seated on the seat body 1 and the other state based on the total load detection value S0 when the seat belt 11 is worn. The
[0040]
In S109, if the total load detection value S0 when the seat belt 11 is worn is equal to or less than a predetermined value A set in advance, the process proceeds to S115. In S115, the CPU 26 determines that the CRS 26 is mounted, and after substituting and storing “4: CRS detected state” as the state data in the state storage memory in the CPU, the CRS in the EEPROM of the nonvolatile memory is stored. In the determination area, “1” indicating the presence of CRS determination indicating that CRS 31 has been determined is substituted, and then the process proceeds to S122.
[0041]
On the other hand, when the total load detection value S0 when the seat belt 11 is worn is larger than the predetermined value A in S109, the process proceeds to S110. This time, it is determined whether the current maximum value SM of the total load detection value S is smaller than the total load detection value S of the four sensors. The maximum value SM is the maximum value of the total load detection value S detected after the seat belt 11 is attached. That is, if it is determined that the maximum value SM is smaller than the calculated total load detection value S, the total load detection value S is greater than the value obtained from the previous calculation (calculated value one cycle before). The CPU 26 determines and proceeds to S112. In S112, the maximum value SM after the seat belt is attached is rewritten to the calculated total load detection value S, and then the process proceeds to S113.
[0042]
On the other hand, if it is determined in S110 that the maximum value SM after the seat belt is attached is equal to or greater than the total load detection value S, the maximum value SM is not updated by the total load detection value S, and the process proceeds to S111. Then, in S111, it is determined whether the difference between the maximum value SM and the total load detection value S is greater than or equal to a predetermined value B determined in advance. The predetermined value B shown here is set to a value for detecting a decrease variation in the total load detection value when the seat belt 11 is tightened when the CRS 31 is mounted and when the seat belt 11 is pressed and released after the tightening. Here, if the difference between the maximum value SM and the total load detection value S is equal to or greater than the predetermined value B, the total load detection value S is significantly reduced, that is, the seat belt 11 is tightened and then pressed down when the CRS 31 is attached. It is assumed that the release of has been detected, and the process proceeds to S115. In S115, as described above, it is determined that the CRS 31 is attached to the seat body 1, and the process proceeds to S115. In S115, “4: CRS state” is substituted into the state storage memory as state data, “1: CRS determination is present” is written in the CRS determination area of the EEPROM 29, and the process proceeds to S122.
[0043]
On the other hand, if it is determined in S111 that the difference between the maximum value SM and the total load detection value S is smaller than the predetermined value B, it is considered that there has been no pressing operation when the CRS is mounted, and the process proceeds to S113. In S113, it is determined whether or not the state where the total load detection value S up to the current calculation is equal to or less than the predetermined value C is confirmed. This determines whether a relatively small load with the CRS 31 temporarily fixed is confirmed. The predetermined value C is set to a value that distinguishes at least a state in which an adult is seated on the seat body 1 and a state other than that.
[0044]
In S113, when it is determined that the state where the total load detection value S is equal to or less than the predetermined value C by the current calculation is confirmed. Proceed to S114. In S114, it is determined whether the total load detection value S is equal to or greater than a predetermined value D. The predetermined value D is set to a value for detecting an increase variation in the total load detection value S accompanying tightening of the seat belt 11 when the CRS 31 is attached. The predetermined value D is set to a value larger than the predetermined value C. If it is determined in S114 that the total load detection value S is equal to or greater than the predetermined value D, the CRS 31 is mounted as if an increase in the total load detection value S due to temporary fastening of the CRS 31 and subsequent tightening of the seat belt 11 is detected. The CPU 26 regards this as being performed and proceeds to S115. Then, in S115, as described above, it is determined that the CRS 31 is attached to the sheet body 1, and "4: CRS state" is substituted as the state data in the state storage memory inside the CPU. The state data is determined to have CRS determination, and the process proceeds to S122.
[0045]
On the other hand, if it is determined in S108 that the seat belt 11 is not worn, the process proceeds to S117. Then, in S117, the maximum value SM, which is a reference for the load fluctuation amount that has been normally used during the seat belt 11, is cleared, and in S118, there is no CRS determination in the CRS determination area of the EEPROM 29. For example, “0: CRS After substituting “mounting indicates release state”, the process proceeds to S119.
[0046]
In S113, when it is confirmed that the total load detection value S is smaller than the predetermined value C until the current calculation, or in S114, the current total load detection value S is smaller than a predetermined value D set in advance. If it is determined, the CPU 26 determines that at least the CRS 31 is not mounted, and proceeds to S119.
[0047]
In S119, a classification for occupant determination as to whether an adult or a child is seated on the seat body 1 is performed. For example, in S119, an adult and a child are classified according to whether or not the total load detection value S of the four sensors is equal to or greater than a predetermined value A. In S119, it is determined that the result of the occupant determination is equal to or greater than the predetermined value A, and the occupant determination is an adult with the predetermined value A or greater (predetermined load or greater), and the process proceeds to S121. In step S121, for example, “3: indicate adult” is assigned as the state data to the state storage memory in the CPU, and then the process proceeds to step S122. On the other hand, if the CPU 26 determines in S119 that the occupant determination result is a child smaller than the predetermined value A, the process proceeds to step 120 in this case. Then, after substituting, for example, “2: indicate a child” as the state data in the state storage memory in the CPU, the process proceeds to S122.
[0048]
Note that the CPU 26 detects “CRS”, “adult”, “children” in a state where the seat belt is fastened according to any one of S115, S120, and S121 depending on the load detection value from the four sensors 21 to 24 or its change amount. , And a signal for changing the output state of the airbag device 30 according to the seating state on the seat body 1 is output, and the airbag is set via the determination output circuit 28. The device 30 can be driven.
[0049]
Next, the process in S122 will be described. In S122, in order to improve the reliability of the data based on the load sensors 21 to 24, the divided state data is compared. In this comparison process, for example, a plurality of one state data (one data) is stored in different memories or different memory areas simultaneously or in time series.
[0050]
In the present embodiment, the present invention is not limited to this, but at the same time, one data is stored in three different memories (may be memory banks) in the CPU, and one data is checked in triplicate. Yes. In other words, the data stored in the three memories, here, three states in which three data match, two data match, or all data do not match by repeating comparison between different memories at least twice It is divided into. In this case, if there is mismatched data, overwrite the matched data on the mismatched data and compare it with the remaining one of the matched data to match two data or all data May be discriminated from each other.
[0051]
After that, if at least one piece of data in each state matches in S123 by such data comparison, the process of the CPU 26 returns to S107, and from S107, the CRS is installed based on the detected load value or the amount of change in load. Or the process which detects the seating state of a child is repeated.
[0052]
On the other hand, if all the data are inconsistent (data is abnormal) due to S123, this time, the data stored in the EEPROM 29 (for example, data stored in the normal state) is trusted, and the CRS determination area of the EEPROM 29 is entered. In order to bring the stored state to the CPU 26, the CPU 26 reads the state stored in the CRS determination area of the EEPROM 29. Then, if the read value is “0” without CRS determination, “1: No occupant” is written in the state storage memory inside the CPU, and then the process returns to S107 and relates to the state classification from S107. The CPU 26 performs processing. On the other hand, if the state of the CRS determination area of the EEPROM 29 is “1” in which CRS determination has already been performed, “4: state in which CRS is mounted” is written in the state storage memory inside the CPU.
[0053]
【The invention's effect】
According to the present invention, the state data from the load detection means is stored in a plurality of memory areas, and the state data is compared by multiple checks. Since the object on the sheet is determined based on the matched state data, the reliability of the determination result can be improved.
[0054]
In this case, if the control means detects the placement of the child restraint device on the seat as the status data on the seat, the control means stores the detection information of the child restraint device in the nonvolatile memory. By storing the detection information of the child restraint device, the state stored in the nonvolatile memory can be reliably maintained even when the power is not supplied to the control device.
[0055]
In addition, when the state data is abnormal, the control unit can make the determination based on the reliable state data stored in the normal state by using the detection information stored in the nonvolatile memory. Therefore, the reliability of the determination result is improved.
[0056]
Further, the control means can control the output of the airbag device to be variable according to a reliable determination result if the output is made variable and the airbag device is operated based on the state data. Therefore, the safety of the airbag device can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle seat to which an on-seat object determination device according to an embodiment of the present invention is applied.
FIG. 2 is a side view of the vehicle seat shown in FIG.
3 shows a sensor bracket provided on the side surface of the vehicle seat shown in FIG. 1, wherein (a) shows a sensor bracket shape on the front side of the vehicle seat, and (b) shows a sensor bracket shape on the rear side of the vehicle seat. It is a perspective view shown.
FIG. 4 is a system configuration diagram of an airbag control device to which an on-seat object determination device according to an embodiment of the present invention is applied.
FIG. 5 is a flowchart showing control of the CPU shown in FIG. 4;
FIG. 6 is a flowchart following FIG. 5;
[Explanation of symbols]
1 Sheet body (sheet)
20 On-seat object determination device
21, 22, 23, 24 Load sensor
25 Controller (control means)
26 CPU (control means)
29 EEPROM (nonvolatile memory)
30 Airbag ECU (Airbag Device)
31 CRS (restraint device for children)

Claims (3)

Load detecting means for detecting a load acting on the seat;
該荷adult to load magnitude based-out before Symbol sheet from heavy detection means, to determine the seating of the child, and a child to based-out before SL on the sheet to the load change from the load detecting means In the on-seat object determination device including a control unit that determines a state of mounting the restraining device for use and classifies the state, and stores the classified state data in the state storage memory .
The state storage memory includes a plurality of memory areas,
The control means includes
It is equipped with a non-volatile memory that stores state data for whether or not a child restraint device is worn even when power is not supplied.
When determining the state, the state data having the same contents are stored in the plurality of memory areas, respectively, and when the child restraint device is detected to be mounted, the state of whether or not the child restraint device is mounted is determined. Stored in non-volatile memory,
When power is first supplied to the control means or when the control means is reset, state data is assigned to each of the plurality of memory areas according to the state data stored in the nonvolatile memory. With
When the state data of at least two of the plurality of memory areas match, the object on the sheet is determined based on the matched state data, and the state data stored in the plurality of memory areas When the two do not match, the object on the sheet is determined based on the state data stored in the non-volatile memory .   When the state data stored in the plurality of memory areas of the state storage memory do not match and the state of the non-volatile memory is determined to be attached to the child restraint device, the control means The state with memory determination is stored in the state storage memory, and when the state of the non-volatile memory is not determination with respect to the child restraint device, the state without occupant is stored in the state storage memory. The on-sheet object determination device according to claim 1. 3. The on-seat object determination device according to claim 1, wherein the control unit activates the airbag apparatus with variable output based on a determination result of the object on the seat. 4. .

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