JPH0712192Y2 - Vehicle occupant protection device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle occupant protection device for protecting data in a non-volatile memory when a CPU runs out of control.

[0002]

2. Description of the Related Art As a conventional vehicle occupant protection device, for example, there is one as shown in FIG. In this FIG.
1 is a vehicle-mounted battery, 2 is an ignition switch connected to the vehicle-mounted battery 1, 3 is a controller, 4 is a DC power source for airbag deployment, and a battery voltage supplied from the vehicle-mounted battery 1 to the controller 3 via the ignition switch 2. Is boosted by the DC / DC converter 5 for increasing voltage, and the backup capacitor 7 is charged via the resistor 6.

In this case, backflow preventing diodes 8a-8
The backflow is prevented by c, and the diode 9 prevents the inrush of current into the backup capacitor 7. Reference numeral 10 is a diagnostic circuit including a CPU 10a and the like, 11 is a processing circuit power supply unit, to which a battery voltage is supplied from the in-vehicle battery 1,
A predetermined voltage is supplied to the diagnostic circuit 10. 12
Is a non-volatile storage unit for exchanging data with the diagnostic circuit 10.

13a to 13e are diodes, and 14 to 19
Is a collision detection unit provided in each part of the vehicle body, and is an acceleration switch 14a that closes the input and output at an acceleration of a predetermined value or more.
.About.19a and resistors 14b to 19b are arranged in parallel. The resistors 14b to 19b are not always necessary. Reference numeral 20 denotes a squeeze provided in the steering section and the like, and an electrode provided in the steering section for igniting explosives for deploying an unillustrated airbag (vehicle occupant protection device).

Reference numeral 21 is a spiral cable formed of a flexible cord wound around the steering shaft for electrically connecting the squeeze 20 and the controller 3 provided on the vehicle body side. Further, 3a to 3n are output terminals of the controller, and from this output terminal 3a, the line L1 is passed through the collision detector 14-output terminal 3b-diode 13a-output terminal 3e-coil cable 21-squeeze 20-output terminal 3f. It is connected to the.

The collision detector 15 is connected between the output terminals 3a, 3c and 3d, and between the line L1 and the output terminal 3g, between the line L1 and the output terminal 3i, between the line L1 and the output terminal 3k,
Diodes 13b to 13e are connected between the line L1 and the output terminal 3m, respectively. Output terminals 3g and 3h
Between the output terminals 3i and 3j, between the output terminals 3k and 3l, and between the output terminals 3m and 3n.
9 is connected. Output terminals 3h, 3j, 3l, 3n
Is connected to the line L2. The line L2 is grounded.

Next, the operation will be described. When the ignition switch 2 is closed, the voltage from the vehicle-mounted battery 1 is boosted by the DC / DC converter 5 and has a time constant determined by the resistor 6 and the backup capacitor 7.
The back-up capacitor 7 is charged via the power source and the charging voltage of the back-up capacitor 7 is always higher than the voltage of the vehicle-mounted battery 1.

The diagnostic circuit 10 inputs data such as the voltage generated in each of the resistors 14b to 19b and the charging voltage of the backup capacitor 7, and the acceleration switches 14a to 14a.
One of 9a becomes a state close to a short circuit and the resistor 14b-
When the voltage generated between the terminals of 19b has a value different from that in the normal state, it is determined and the nonvolatile storage unit 1
Store in 2. In addition, the non-volatile storage unit 12 stores which acceleration switch is turned on when any of the acceleration switches 14a to 19a is turned on due to a collision or the like.

In the above structure, the vehicle collides with each other to generate a negative acceleration more than a predetermined value, and the acceleration switches 14a, 15
When any one of "a" and any of the acceleration switches 16a to 19a is turned on, the voltage charged in the backup capacitor 7 flows, for example, as indicated by a broken line, and the squeeze 2
0 generates heat, the powder is ignited, and the airbag is deployed.

[0010]

However, in such a conventional vehicle occupant protection device, the vehicle occupant is not provided.
The diagnostic CPU that diagnoses the failure of each electronic component of the protection device
Although provided, means for notifying passengers of these failures
Since these were not provided,
I only knew it. Therefore, the occupants are
Do not notice the obstacle and have it repaired promptly for the failure
The air bag will not operate in the event of a vehicle collision.
Therefore, there is a problem that the occupant cannot be protected.
Was there.

The present invention has been made in view of such a conventional problem, and the diagnostic CPU has a failure of an electronic component.
When an occupant is detected, the occupant is notified of an electronic component failure.
The purpose is to solve the above problems.

[0012]

A vehicle occupant protection system according to the present invention counts a reset signal from a reset circuit and notifies a failure of a CPU or the like when the counted value reaches a predetermined value. It was done.

[0013]

The occupant protection device for a vehicle according to the present invention is a diagnostic device.
By informing the crew of the circuit failure, the crew can
Quickly notice a failure of an electronic component and promptly respond to the failure
Since it can be repaired by the
The passenger protection device can be operated reliably.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. Also in this invention, the overall structure of the vehicle occupant protection device is the same as that of the conventional device shown in FIG.

FIG. 1 shows a diagnostic circuit included in the vehicle occupant protection system of the present invention. In FIG. 1, 101 is a diagnostic circuit for diagnosing an error state of each part of the electronic circuit of the vehicle occupant protection system. CPU, 102 is a diagnostic CPU 10
A counter that counts a reset pulse output from a watchdog timer circuit 103, which will be described later, at the time of a runaway of 1.
Reference numeral 103 detects a predetermined clock pulse output from the output port at a constant frequency when the program of the CPU 101 is operating normally, and repeatedly outputs a reset pulse due to the non-detection of the clock pulse when the program operation is abnormal. This is a watchdog timer circuit, and all of them are well known.

Reference numeral 104 is an OR gate, the input terminal of which is connected to each of the output port of the diagnostic CPU 101 and the output terminal of the flip-flop (hereinafter abbreviated as F / F) 125 of the counter 102, and the signals output by them are input. To do. The output terminal of the OR gate 104 is connected to the base of the transistor 132 via the resistor 131. The emitter of the transistor 132 is grounded, and the collector is connected to the positive power source via the warning lamp 133.

Therefore, the watchdog timer circuit 1
03 is a resistor 111,113,115,
119, capacitors 112 and 118, inverter 11
4, 120 and diodes 116 and 117.

Further, the counter 102 includes a capacitor 122 and a resistor 121, which are power sources, and F / Fs 123, 124,
It consists of 125 and AND gate 126. Since the operation of the above is well known, detailed description thereof will be omitted.

Next, the operation will be described. CPU 101 for diagnosis
Constantly diagnoses each part of the electronic circuit, and if there is no abnormality in the program operation, it outputs a clock of a constant frequency from the output port, and the watchdog timer circuit 10
3, but at this time the watchdog timer circuit 1
No. 03 does not output the reset pulse, only setting the output to L or H.

On the other hand, when the CPU 101 normally runs out of control, the watchdog circuit 102 returns to normal operation with one reset pulse, so only one reset pulse is output,
Therefore, the CPU 101 returns immediately and the counter 1
The output of the F / F 125 of 03 does not become high level, and the warning lamp 133 does not light.

On the other hand, when the CPU 101 fails, one reset pulse does not return to normal operation, so the watchdog circuit 102 continues to output reset pulses. Therefore, if the CPU 101 does not recover, the reset pulse is also input to the counter 102, so that a negative output from the terminal P of the F / F 124,
When both reset pulses go high, the output of the AND gate 126 goes high, and the F / F125
Output becomes high level, the transistor 132 turns on, the warning lamp 133 lights up, and the CPU 101
The failure is notified to an operator such as a user.

[0022]

[Effects of the Invention] As described above, according to this invention,
For example, the reset signal from the reset circuit is counted and the specified value
It is configured to notify the failure of the diagnostic circuit when
As a result, the crew quickly noticed a failure of the electronic components and
It is possible to quickly repair the obstacle. According to
To ensure that the vehicle occupant protection device is activated in the event of a vehicle collision.
Because it is possible to protect the occupant.
There is an effect.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional vehicle occupant protection device.

[Explanation of symbols]

 14-17 Collision detector 20 Operation control circuit 102 Counter 133 Warning lamp (informing means)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hirohisa Nakata 2-1910 Nisshin-cho, Omiya-shi, Saitama Kansei Co., Ltd. (72) Genichiro Tsurushima 2-1910 Nisshin-cho, Omiya-shi, Saitama Kansei Co., Ltd. ( 56) References Japanese Unexamined Patent Publication No. 51-55534 (JP, A) Actual development No. 51-110426 (JP, U) Japanese Patent Publication No. 52-12456 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A collision detector mounted on a vehicle, an operation control circuit for inflating an airbag based on a detection output from the collision detector, and at least one of the operation control circuit and the collision detector. A diagnostic circuit that checks one of the abnormalities and outputs a pulse of a constant cycle, a non-volatile storage unit that stores the abnormality detected by the diagnostic circuit, and inputs a pulse of a constant cycle from the diagnostic circuit, In a vehicle occupant protection device including a reset circuit that supplies a reset signal to the diagnostic circuit when the pulse input state is abnormal, when the reset signal from the reset circuit is counted and reaches a predetermined value, the diagnostic circuit An occupant protection device for a vehicle, which is provided with an informing means for informing of the failure of