JPH08282430A - Driver/passenger constraining device - Google Patents

Abstract

PURPOSE: To fascilitate clarification of the cause of a trouble when a driver/ passenger constraining means, for example an air bag, is not in the optimum operation. CONSTITUTION: A saving sensor 32 is installed which is turned on mechanically according to the degree of an impact applied. In case the sawing sensor 32 is OFF and nevertheless the calculated value of acceleration G exceeds a first reference acceleration value GS1 and also in case the saving sensor 32 remains ON, the data for the calculated value of acceleration G, the failure code, and the following three conditions is repetitively collected one after another for a specified period of time for each value of failure flag FFAIL (1 or 0); i.e., the ON/OFF condition the sensor 32, ON/OFF condition of a squib 28 and squib 30, and ON/OFF condition of an ignition transistor 34. The collected data is accumulated on the time series basis in the specified storing area of a non-volatile memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant restraint device having an occupant restraint means that operates to restrain an occupant seated on a seat.

[0002]

2. Description of the Related Art In an occupant restraint system of this type, the occupant restraint means does not normally operate, and the occupant restraint means does not operate in the front, side,
When the external force applied to the vehicle obliquely from the front is large to some extent, it is activated to restrain the occupant.
In such an occupant restraint system, failure detection of the system is always performed. By the way, in vehicles,
An airbag system that deploys a folded airbag using gas and a seatbelt with a loader mechanism that winds the pulled out seatbelt using gas are commonly used as this occupant restraint system. . In these devices, for convenience of igniting the gas generating agent to generate gas, failure detection is performed on operation control devices such as various devices and circuits for igniting the gas generating agent.

Various techniques have been proposed for the purpose of investigating the cause when a failure occurs. For example, JP-A-5
-270352 measures the elapsed time from the failure of the operation control device and the elapsed time from the time when the operation control device should deploy the airbag when an external force of a certain amount is applied to the vehicle. . Then, by comparing both elapsed times, the temporal front-rear relationship between the occurrence of a failure of the operation control device and the time when an external force of a certain magnitude is applied to the vehicle is determined, and the failure and the application of the external force are determined by the determination result. It has been proposed to understand the causal relationship with. The external force includes not only the force applied from the front side of the vehicle but also the force applied from the side of the vehicle or the diagonally front side, and the airbag to be deployed only differs depending on the direction. Therefore,
In the following description, the direction in which the external force is applied does not matter unless otherwise indicated.

[0004]

However, in the conventional occupant restraint system proposed in the above publication, the following problems remain unsolved.

Even if the causal relationship between the failure of the operation control device and the application of the external force is found, it is not sufficient to grasp the state of deployment of the airbag, and the acceleration, which is the degree of the external force, is slightly referred to. It was only to estimate whether or not the deployment of the airbag was optimal by. For this reason, it is unknown under what circumstances the airbag is actually deployed by the operation control device. More specifically, even if the airbag deploys due to the application of a large external force, it is unclear whether the deployment timing was optimal. In other words, the investigation of the cause when the operation of the airbag is not optimal remains insufficient. Moreover, even if the deployment status of the airbag is recorded for the convenience of measuring the time from the time when the external force of a certain magnitude is applied, the recording after the time when the external force becomes the force of the magnitude to deploy the airbag. Only remains. Therefore, even if there is no record before the airbag is deployed, investigation of the cause when the airbag operation is not optimal remains insufficient.

Further, when it is determined that the malfunction of the operation control device is before the application of the external force, and the airbag is expanded by the subsequent application of the external force, it means that the air bag is expanded despite the malfunction of the operation control device. become. Therefore, a doubt arises in the failure determination, and the reliability of the determination is lacking.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an occupant restraint system capable of investigating the cause when the operation of the occupant restraint means is not optimal.

[0008]

The means adopted in the occupant restraint system according to claim 1 for attaining the above object is an occupant restraint means which operates to restrain an occupant seated in a seat on the seat. A passenger restraint system having:
Starting means for starting the occupant restraining means, a power supply for supplying a current to the starting means, current supply control means for controlling current supply from the power supply to the starting means, and detection of an external force applied to the vehicle The external force generation status detection means and the external force generation status detected by the external force generation status detection means are
Satisfying the predetermined condition of 1 as one condition of the current supply by the current supply control means, the operation control means for controlling the current supply control means and the external force generation status detected by the external force generation status detection means are the first The storage means for storing the control status of the current supply by the current supply control means in time series from the time when the second predetermined condition relaxed from the predetermined condition is satisfied.

In the occupant restraint system according to a second aspect of the invention, in addition to the control status of the current supply by the current supply control means, the storage means stores the external force generation status detected by the external force generation status detection means in time series. To remember it.

Further, the means adopted in the occupant restraint system according to claim 3 is an occupant restraint device having occupant restraint means for operating to restrain a occupant seated on a seat to the seat. Starting means for starting, power source for supplying current to the starting means, current supply control means for controlling current supply from the power source to the starting means, and external force occurrence status detection for detecting occurrence status of external force applied to the vehicle Means and the operation control means for controlling the current supply control means, with the condition that the generation condition of the external force detected by the external force generation condition detection means satisfies the first predetermined condition as one condition for the current supply by the current supply control means. An operation presence / absence determination means for determining whether or not the occupant restraint means is activated, a current supply control status by the current supply control means, and an external force generation status detection means. And occurrence of forces, and the presence or absence of the operation of determining the the occupant restraining means of the actuating existence determination means, and its gist in that it comprises a storage means for time-sequentially stored in association with each other.

In the occupant restraint system according to the fourth aspect, the storage means stores the failure status of the current supply control means in time series.

[0012]

According to the occupant restraint system of the present invention having the above-mentioned structure, when the external force generation condition detected by the external force generation condition detecting means satisfies the first predetermined condition, the operation control means supplies the current with this condition as one condition. The control means is controlled. As a result, the occupant restraining means is activated by the activating means that receives current from the power supply by the current supply control means, and operates so as to restrain the occupant seated on the seat in the seat. On the other hand, when the external force generation state detected by the external force generation state detection means satisfies the first predetermined condition, the second predetermined condition relaxed from the first predetermined condition is the first predetermined condition. Filled and filled prior to activation of the occupant restraint. Therefore, the control status of the current supply by the current supply control means is
From the time when the second predetermined condition is satisfied, that is, the time before the operation of the occupant restraint means, it is surely stored in the storage means in time series.

Therefore, the operating condition of the occupant restraining means which operates when the first predetermined condition is satisfied can be surely grasped through the stored current supply control condition. Further, it is sufficient to store the data when the second predetermined condition is satisfied, and it is not necessary to always store the data.

In the occupant restraint system according to the second aspect, the external force generation status detected by the external force generation status detection means is also stored in time series in the storage means in addition to the current supply control status by the current supply control means. . Therefore, the time-series relationship between the current supply control state and the external force generation state before and after the operation of the occupant restraint means is clarified.

In the occupant restraint system according to the third aspect of the present invention, when the external force generation condition detected by the external force generation condition detecting means satisfies the first predetermined condition, the operation control means supplies the current with this condition as one condition. The control means is controlled. As a result, the occupant restraining means is activated by the activating means that receives current from the power supply by the current supply control means, and operates so as to restrain the occupant seated on the seat in the seat. On the other hand, the presence / absence of operation of the occupant restraining means is determined by the operation presence / absence determining means. Then, the presence or absence of the operation of the occupant restraint means and the control status of the current supply by the current supply control means are stored in the storage means in time series in association with the external force generation status detected by the external force generation status detection means. . Therefore, by analyzing the stored result, the relationship between the presence / absence of the operation of the occupant restraint means, the control status of the current supply, and the generation status of the external force is clarified in time series.

In the occupant restraint system according to the fourth aspect, the failure status of the current supply control means is also stored in the storage means in time series. Therefore, the time-series relationship between the presence / absence of actuation of the occupant restraint means, the external force generation status, and the failure status of the current supply control means is clarified.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an occupant restraint system according to the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an occupant restraint system 10 of an embodiment mounted on a vehicle.

As shown in the figure, the occupant restraint system 10 operates in accordance with the deployment determination of the occupant restraint airbag (not shown) (driver airbag and passenger occupant airbag) and the failure status of this device. In addition to the microcomputer 12 for monitoring the situation, the following items are provided.

The occupant restraint system 10 has, as a control system, an acceleration sensor 1 for detecting the acceleration applied to the vehicle due to the collision.
4, a nonvolatile memory 16 such as an EEPROM that stores data transferred from the microcomputer 12 and retains the data even after the power is turned off, and a monitor 18 that displays the operation status of the microcomputer 12.
Prepare by connecting to. The microcomputer 12 is a CP
U, ROM, and RAM are mainly configured as a logical operation circuit, and input / output with the above-described acceleration sensor 14 and the like is performed by an input / output port interconnected with these via a common bus.

The occupant restraint system 10 includes, as an ignition system, a battery 20, a diode circuit 22 for rectifying a power supply current supplied from the battery 20 to obtain an ignition power supply, and a voltage of the ignition power supply. DC-D for converting
A C-converter 24 and a backup power supply 26 containing a large-capacity capacitor are provided, and the squib 2 for the driver airbag and the passenger occupant airbag is included in the circuit thereof.
It has a safing sensor 32 and an ignition transistor 34 sandwiching 8 and 30. Therefore, the squib 2 of this embodiment
Numerals 8 and 30 are activating means for activating both of the airbags, which are occupant restraining means of the invention.

The safing sensor 32 is normally off.
However, it is a mechanical acceleration sensor that emits an ON signal when the vehicle is decelerated in the front-rear direction, and its set acceleration (first reference acceleration GS1) is the second reference acceleration GS2 (for the acceleration sensor 14). (Acceleration at which the ignition signal is issued to the ignition transistor 34). The base of the ignition transistor 34 is connected to the microcomputer 12, and the ignition transistor 34 is turned on upon receiving a control signal from the microcomputer 12. Therefore, when both the safing sensor 32 and the ignition transistor 34 are turned on, the ignition current is supplied to the squibs 28 and 30. That is, in the present embodiment, the ignition transistor 34, which is responsible for supplying the ignition current, has the squibs 28, 3 serving as the starting means of the present invention.
It is a current supply control means for controlling the current supply from the power supply to 0.

The backup power supply 26 discharges the electric charge stored in the capacitor and supplies an ignition current to the squibs 28 and 30 even when the power supply from the battery 20 is cut off due to the disconnection of the wiring at the time of a collision. Supply. Therefore, in this embodiment, the battery 20 or the backup power supply 26 is the power supply of the present invention. In addition, the diode circuit 22 is connected to the battery 2 when the ignition switch 40 or the accessory switch 42 is turned on.
Power supply current is supplied from 0.

In addition to this, the occupant restraint system 10 is provided with an airbag warning light 36. When the microcomputer 12 detects an abnormality in the occupant restraint system 10, the airbag warning light 36 is turned on to inform the passenger. To do.

The microcomputer 12, not only the acceleration sensor 14 of the control system involved in the deployment of the airbag, but also the safing sensor 32 of the ignition system and the squib 28,
30 and ignition transistor 34 are also connected.
Then, the occupant restraint system 10 as a whole is constantly monitored for the presence or absence of a failure, for example, whether or not there is an open / short circuit of electrical wiring or a continuity failure of these devices, and if there is a failure, an airbag warning is given as described above. The light 36 is turned on. If the microcomputer 12 determines that there is a failure during monitoring of the failure, it turns on the airbag warning lamp 36 and codes the details of the failure in detail for each failure mode. This failure code is stored in the non-volatile memory 16 by the processing described later. Further, the microcomputer 12 is connected to the data extraction terminal 38, and when a dedicated checker is connected to the terminal, the microcomputer 12 outputs the data stored in the nonvolatile memory 16 to the checker.

Next, various processes performed by the occupant restraint system 10 of the present embodiment having the above-mentioned structure will be described with reference to the flowcharts of FIG. Note that the interrupt timing and the priority order of the processes described below are adjusted in advance.

First, the failure monitoring process will be described. FIG. 2 is a flowchart showing this failure monitoring processing, and the processing is interrupted at predetermined time intervals. When this process is started, a failure check is first performed (step S100). Specifically, a small simulated voltage is applied to the acceleration sensor 14, the safing sensor 32, the squibs 28 and 30, the ignition transistor 34, and the like to check whether there is an open / short circuit of electrical wiring or a conduction failure of these devices. To do. In addition, the ignition switch 40
After the power is turned off, the discharge state of the capacitor in the backup power supply 26 is checked to check whether or not there is a specified capacity.

Then, it is judged from the check result whether or not there is a failure (step S110), and if it is judged that there is a failure, a lighting signal is output to the airbag warning lamp 36 to turn on the warning lamp (step S120). As a result, the occupant is notified that the occupant restraint device 10 has an abnormality (failure). On the other hand, if a negative determination is made in step S110, it is determined that there is no failure or the repair of the failure is completed, and the airbag warning light 36 is turned off (step S130).

After that, details of the failure are coded in detail for each failure mode (step S140), and this routine is once terminated. Even if the determination is negative in step S110 and there is no failure, the fact that there is no failure is coded.

Next, the airbag deployment process will be described. FIG. 3 is a flowchart showing this airbag deployment processing, and the processing is interrupted at predetermined time intervals. When this process is started, first, the acceleration sensor 1
4 is scanned and the detection signal is read (step S
150), the acceleration applied to the vehicle is calculated based on the signal (step S160). Note that this step S1
The acceleration calculated in 60 is the acceleration in the direction corresponding to the airbag arranged at an appropriate location in the vehicle compartment so as to deploy in response to the impact from the front of the vehicle or the impact from the diagonal or side. For example, in the case of an airbag that is provided in front of the seat and deploys in response to an impact from the front of the vehicle, the acceleration in the vehicle front-rear direction is calculated.

Next, it is judged whether or not the calculated acceleration calculation value G exceeds a predetermined second reference acceleration GS2 which is preset as an acceleration for expanding the airbag (step S170), and a positive judgment is made. For example, an ignition signal is output to the ignition transistor 34 to turn on the transistor (step S180), and this routine is once terminated.

If an affirmative decision is made in step S170, the first reference acceleration GS1 of the safing sensor 32.
Is smaller than the second reference acceleration GS2 of the acceleration sensor 14 as described above, so that if the safing sensor 32 is normal without failure, the safing sensor 32
Is naturally turned on. Therefore, in this case, the ignition current is supplied to the squibs 28 and 30 from the diode circuit 22 or the backup power supply 26, so that both the driver airbag and the passenger occupant airbag are deployed. Whether or not the airbag is deployed at this time is determined by the open / short state of the squibs 28 and 30 through the voltage monitor. On the other hand, if a negative determination is made in step S170, this routine ends without performing any processing.

Therefore, in the present embodiment, the external force generation state for detecting the external force generation state applied to the vehicle by the acceleration sensor 14 involved in the deployment of the airbag and the acceleration calculation process in the airbag deployment process (step S160). A detection means is configured. Further, the acceleration control in the airbag deployment process (step S170) and the ignition transistor ignition process (step S180) constitute the operation control means for controlling the ignition transistor 34 (current control) which is the current supply control means of the present invention. It When the acceleration calculated value based on the detection signal of the acceleration sensor 14 exceeds the second reference acceleration GS2, the first predetermined condition is satisfied as one condition of the current supply by the current supply control means.

Next, the data storage process will be described.
FIG. 4 is a flowchart showing this data storage process, and this process is a main process that is repeatedly executed at predetermined time intervals. When this process starts, first,
ON by applying a small simulated voltage to the safing sensor 32
It is determined whether or not (step S200). Here, if a negative determination is made (sensor OFF), the acceleration calculation value G calculated in the airbag deployment processing described above is read (step S210), and whether the read acceleration calculation value G is equal to or greater than the first reference acceleration GS1. It is determined whether or not (step S2
20). If a negative determination is made here, this routine is once ended without performing any processing. That is, if the safing sensor 32 is OFF and the calculated acceleration value G is smaller than the first reference acceleration GS1, the airbag need not be deployed. Therefore, this routine is terminated because it is not necessary to collect data to be described later for data analysis such as whether or not the airbag deployment is optimum.

However, if an affirmative determination is made, since some acceleration (first reference acceleration GS1) is applied, it may be necessary to analyze the data, and the failure code coded in the above-described failure monitoring processing is read ( Step S
230). It should be noted that the reading of this failure code is executed because data analysis is required even when an affirmative determination (sensor ON) is made in step S200.

Then, the occupant restraint system 10 is selected from the failure code.
It is determined whether or not there is a failure (step S240), and if a positive determination is made, a value 1 is set to the failure flag FFAIL indicating that there is a failure (step S250), and if a negative determination is made, a value 0 is set to the failure flag FFAIL. It is set and initialized (step S260). After that, the data to be stored in the non-volatile memory 16 is collected. The collected data at this time include the acceleration calculation value G, the fault code, the ON / OFF state of the safing sensor 32, the ON / OFF states of the squib 28 and the squib 30, and the ON state of the ignition transistor 34.
/ OFF state.

Therefore, following steps S250 and 260, the acceleration calculation value G and the fault code are read (step S270), the voltage of the safing sensor 32 is monitored by applying a small simulated voltage (step S280), and the squib is also used. 28 and squib 30 voltage monitor (step S
290), the output status of the ignition signal to the ignition transistor 34 is sequentially monitored (step S300). In addition,
Acceleration calculation value G read in steps S210 and 230
The reason why the failure code is read again is to match the number of data with other data.

The result of the voltage monitoring of the squib 28 and the squib 30 in step S290 means that the airbag is inflated if the result is ON, and is OFF.
If so, it means that the expansion was not done. Therefore, the voltage monitoring process (step S290) constitutes an operation presence / absence determining means for determining the presence / absence of the operation of the airbag as the occupant restraining means of the present invention.

When data is sequentially collected in this manner, the collected data is buffered in the RAM of the microcomputer 12 and temporarily stored (step S31).
0). Then, it is determined whether or not a predetermined time has elapsed since the start of this process (step S320), and the processes of steps S270 to S310 described above are repeated until a positive determination is made, and buffering is continued. That is,
Data of the acceleration calculation value G, the fault code, the ON / OFF state of the safing sensor 32, and the like is repeatedly collected during this elapsed time, and as shown in FIG. A group of data in units of number is temporarily stored for each failure flag FFAIL defined in steps S250 and 260. Note that FIG. 5 shows a case where the failure flag FFAIL is 0 (no failure).

When it is determined in step S320 that the predetermined time has elapsed, the group of data temporarily stored up to that point (see FIG. 5) is written in a predetermined storage area of the non-volatile memory 16 (step S330), and the above-described operation is performed. The process from step S200 is repeated. The buffering of the data of the data group shown in FIG. 5 to the RAM of the microcomputer 12 is performed by overwriting in a predetermined area.
A data group is accumulated in the non-volatile memory 16 in time series as long as the storage area has room.

Data writing (step S330) and the non-volatile memory 16 in this data storing process of the present embodiment.
Then, the storage means of the present invention is configured. Further, when the calculated acceleration value based on the detection signal of the acceleration sensor 14 exceeds the first reference acceleration GS1 which is smaller than the second reference acceleration GS2, it is the second time point at which the storage in the storage means of the present invention is started.
The predetermined condition of is satisfied.

As described above, the occupant restraint system of the present embodiment has the presence or absence of the deployment of the driver airbag and the passenger occupant airbag, and the safing sensor 32 and other devices constituting the occupant restraint system 10. The operating status and the failure status of each of these devices are turned on / off by the safing sensor 32.
FF state, ON / O of squib 28 and squib 30
The FF state, the ON / OFF state of the ignition transistor 34, and the failure code are grasped, and these data are stored in the non-volatile memory 16 in time series in association with the acceleration calculation value G representing the state of collision. Therefore, if this stored result is read and analyzed by a dedicated checker connected to the data extraction terminal 38, the presence or absence of airbag deployment, the operating status of each of the above devices, and the failure status and collision status (external force generation) Situation), the relationship is elucidated in time series.

Therefore, according to the occupant restraint system 10 of the present embodiment, when the deployment of the airbag is not optimal, the operation is not optimal by clarifying the time series relationship of the above data. The cause can be investigated, the occurrence status of the failure can be clearly determined, and the quality of the monitoring result of the failure status can be determined. For example, as shown in FIG. 6, the failure code is some kind of “failure present” code as a result of time-series data analysis, and the acceleration calculation value G is not the acceleration sufficient to deploy the airbag (the first criterion). Acceleration GS1 <acceleration calculation value G <second reference acceleration GS
2), safing sensor 32 is OFF, squib 28
If the squib 30 is OFF and the ignition transistor 34 is OFF, the acceleration calculation value G <the second reference acceleration GS2 is received and a negative determination is made in step S170, and the airbag is not deployed. In such a case, it can be understood that the failure check performed in the failure monitoring process and its determination (steps S100 and 110) are defective. Therefore, by repairing / maintaining the check item determined to have a failure, such a defect thereafter can be avoided.

It is to be noted that whether the squib is opened (ON) is due to the airbag deployment operation or simply due to the open failure, the safing sensor 32 is turned off.
N, ON of the ignition transistor 34, etc. are performed by the inspector based on the storage result of the data stored in time series. That is, the squib voltage monitoring process (step S290), which is the operation presence / absence determining means, also monitors the state variable that changes due to the operation of the airbag, specifically, the open / short (ON / OFF) of the squib.

Further, when the acceleration calculation value G increases as shown in FIG. 6 and coincides with the first reference acceleration GS1, the affirmative judgment in step S220 is received, and the processes in and after step S230 are executed. That is, data collection is started as described before before the acceleration calculation value G reaches the second reference acceleration GS2 which is a condition for airbag deployment, and the data collection is performed for a predetermined period. Then, by analyzing the collected data, whether or not the relationship between the deployment of the airbag and the operation of each device is correct in time series, for example, whether each device normally operates at a predetermined timing, It is possible to clarify whether or not the airbag has been deployed at the timing.

Alternatively, when the deployment of the airbag is not optimal when a certain amount of external force is applied from the front of the vehicle, the diagonally forward direction, or the side of the vehicle, analysis of the time-series data shows that It can be clarified whether the cause is that the safing sensor 32 is not turned on at the optimum timing, or that the acceleration calculation value G has not increased enough to deploy the airbag. Furthermore, although the acceleration calculation value G has increased to a value (second reference acceleration GS2) sufficient for expanding the airbag, the ignition signal is not output to the ignition transistor 34 at the optimum timing. Is there a squib 28,
It can be clarified whether the cause is that the supply state of the ignition current to 30 is not optimal, or whether the squibs 28 and 30 are open from the beginning.

Further, in the occupant restraint system 10 of this embodiment,
Even if the safing sensor 32 is OFF, if the acceleration calculation value G is the first reference acceleration GS1 or more, data collection is performed, and the acceleration calculation value G is the first reference acceleration GS1.
It was configured not to collect data if smaller. Therefore, according to the occupant restraint system 10, it is possible to increase the analysis target data that is effective for investigating the cause of the failure and the like and improve the analysis accuracy, and it is possible to effectively use the storage area of the non-volatile memory 16. .

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and may be implemented in various modes without departing from the scope of the present invention. Of course.

[0048]

As described above in detail, in the occupant restraint system according to the first aspect, it is the time when the second predetermined condition relaxed from the first predetermined condition for operating the occupant restraint means is satisfied. From the time before the operation of the occupant restraint means, the control status of the current supply by the current supply control means is stored in time series in the storage means. Therefore, the control status of the current supply by the current supply control means is surely stored in time series before the operation of the occupant restraint means, and the operation status of the occupant restraint means is stored through the stored control status of the current supply. It is surely grasped. Therefore, according to the occupant restraint device of the first aspect, the operating condition of the occupant restraint means before and after the actuation of the occupant restraint means is clarified through the analysis of the time-series memory results, and the occupant restraint means operates optimally. If not, the cause can be surely investigated.

Further, according to the occupant restraint system of the first aspect, it is sufficient to store the control status of the current supply from the time when the second predetermined condition is satisfied, and it is not necessary to always store it, so the storage means. Can be used effectively.

In the occupant restraint system according to the second aspect, the time-series relationship between the external force generation state and the current supply control state before and after the operation of the occupant restraint means can be clarified. Therefore, according to the occupant restraint device of the second aspect, it is possible to improve the reliability of investigating the cause when the occupant restraint means is not optimally actuated by clarifying the time-series relationship.

Further, in the occupant restraint system according to claim 3,
Whether or not the occupant restraint means is activated, the current supply control status of the current supply control means, and the external force generation status are associated with each other and stored in time series in the storage means. Therefore, according to the occupant restraint device of the third aspect, the cause when the operation of the occupant restraint means is not optimal can be clarified through the analysis of the time-series memory result.

In the occupant restraint system according to the fourth aspect, the occupant restraint means is actuated, the external force is generated, and the current supply control means is broken down. It can be clearly discriminated, and the quality of the failure status monitoring result can be judged. Therefore, according to the occupant restraint system of the fourth aspect, it is possible to improve the reliability of the situation determination of the failure occurrence and the monitoring result thereof.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an occupant restraint device 10 of an embodiment mounted on a vehicle.

FIG. 2 is a flowchart showing a failure monitoring process performed by the occupant restraint system 10.

FIG. 3 is a flowchart showing an airbag deployment process of the occupant restraint system 10 in the same manner.

FIG. 4 is a flowchart showing a data storage process of the occupant restraint system 10.

FIG. 5 is an explanatory diagram illustrating a storage state of data stored in a nonvolatile memory 16.

6A and 6B are explanatory views for explaining the processing states of the occupant restraint apparatus 10 and the effects thereof.

[Explanation of symbols]

 10 ... Occupant restraint device 12 ... Microcomputer 14 ... Acceleration sensor 16 ... Nonvolatile memory 18 ... Monitor 20 ... Battery 22 ... Diode circuit 24 ... DC-DC converter 26 ... Backup power supply 28, 30 ... Squib 32 ... Safing sensor 34 ... Ignition Transistor 36 ... Airbag warning light 38 ... Extraction terminal 40 ... Ignition switch 42 ... Accessory switch GS1 ... First reference acceleration GS2 ... Second reference acceleration

Claims (4)

[Claims] 1. An occupant restraint apparatus having an occupant restraint means for restraining an occupant seated on a seat to the seat, the occupant restraint means activating the occupant restraint means, and supplying current to the starter means. A power supply, a current supply control means for controlling current supply from the power supply to the starting means, an external force generation status detection means for detecting a generation status of an external force applied to the vehicle, and an external force detected by the external force generation status detection means. The operation control means for controlling the current supply control means, and the generation of the external force detected by the external force generation status detection means, assuming that the generation condition satisfies the first predetermined condition as one condition of the current supply by the current supply control means. A storage device that stores the control status of the current supply by the current supply control means in time series from the time when the condition satisfies the second predetermined condition that is relaxed from the first predetermined condition. An occupant restraint system comprising: a step. 2. The occupant restraint system according to claim 1, wherein the storage means includes the external force generation status detected by the external force generation status detection means in addition to the current supply control status by the current supply control means. An occupant restraint system that also memorizes passengers in time series. 3. An occupant restraint apparatus having an occupant restraint means for restraining an occupant seated on a seat to the seat, the occupant restraint means activating the occupant restraint means, and supplying current to the starter means. A power supply, a current supply control means for controlling current supply from the power supply to the starting means, an external force generation status detection means for detecting a generation status of an external force applied to the vehicle, and an external force detected by the external force generation status detection means. An operation control means for controlling the current supply control means, and an operation for determining whether or not the occupant restraint means is operated, assuming that the occurrence condition satisfies a first predetermined condition as one condition of the current supply by the current supply control means. Presence / absence determination means, control status of current supply by the current supply control means, and generation status of external force detected by the external force generation status detection means,
An occupant restraint device comprising: a storage unit that stores the presence or absence of the operation of the occupant restraint unit, which is determined by the operation presence / absence determination unit, in a time series in association with each other. 4. The occupant restraint system according to claim 3, wherein the storage means stores the failure status of the current supply control means in time series.