JPH0637017Y2 - Air back system - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag system in which an air bag diagnosis circuit operates only when traveling.

[Prior art]

As a conventional airbag system, there is one as shown in FIG. 3, for example. In FIG. 3, 1 is an in-vehicle battery, 2 is an ignition switch connected to the in-vehicle battery 1, 3 is a controller, 4 is a DC power supply for airbag deployment, and the controller 3 is connected from the in-vehicle battery 1 via the ignition switch 2. The voltage of the battery to be supplied to the
The backup capacitor 7 is charged via. In this case, the backflow prevention diodes 8a to 8c prevent the backflow, and the diode 9 prevents the current from flowing into the backup capacitor 7. 10 is a diagnostic circuit including a CPU, 11 is a diagnostic circuit power supply unit,
The battery voltage is supplied from the vehicle-mounted battery 1, and the diagnostic circuit
It supplies a predetermined electric power to 10. 12 is a storage unit,
Data is exchanged with the diagnostic circuit 10. The collision detector 15 is connected between the output terminals 3a, 3c and 3d,
Between L1 and output terminal 3g, between line L1 and output terminal 3i, line L1
Diodes 13b to 13e are connected between the output terminal 3k and the output terminal 3k, and between the line L1 and the output terminal 3m. Output terminals 3g and 3h, output terminals 3i and 3j, output terminals 3k and 3l
Between the output terminals 3m and 3n, and the collision detectors 16 to 19 respectively.
Are connected. The output terminals 3h, 3j, 3l, 3n are connected to the line L2. Line L2 is grounded. Next, the operation will be described. Ignition switch 2
Is closed, the voltage from the vehicle-mounted battery 1 is boosted by the DC / DC converter 5 and the resistor 6 is charged to the capacitor 7 via the diode 8c with a time constant determined by the backup capacitor 7, and the charging voltage of the backup capacitor 7 is charged. Is always higher than the voltage of the in-vehicle battery 1. The diagnostic circuit 10 detects the voltage generated in each of the resistors 14b to 19b,
Data such as the charging voltage of the backup capacitor 7 is input, and one of the acceleration switches 14a to 19a is in a state close to a short circuit, and the voltage generated between the terminals of the resistors 14b to 19b has a value different from the normal value. In such a case, it is determined and stored in the storage unit 12. Further, the 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 configuration, when the vehicle collides and negative acceleration more than a predetermined value is generated, and any one of the acceleration switches 14a and 15a and any one of the acceleration switches 16a to 19a are turned on, the voltage charged in the backup capacitor 7 is, for example, Flowing as shown by the broken line, the squeeze 20 generates heat, gunpowder is ignited, and the airbag is deployed.

[Problems to be solved by the device]

However, in such a conventional air bag system, since the air bag diagnostic circuit 10 is activated when the ignition switch 2 is turned on, the ignition switch 2 is turned on when repairing other than the air bag. If a part that has an influence on the airbag system is removed as it is, for example, an operation of disconnecting the connector is performed, the diagnostic circuit 10 is activated, which is recorded as a failure and the warning lamp is turned on. The present invention has been made in view of such conventional problems, and it is possible to solve the above problems by operating the airbag diagnostic circuit only during traveling by sensing when traveling. Has an aim.

[Means for Solving the Problems]

An airbag system according to the present invention stores a stop sensor that detects a stopped state of a vehicle, an operation control circuit that deploys an airbag, or at least one of a collision detector in the storage unit when an abnormality is detected, In addition, a diagnostic circuit for stopping the storage in the storage unit while the detection signal is output from the stop sensor is provided.

[Action]

The diagnostic circuit according to the present invention checks for an abnormality in at least one of an operation control circuit for inflating an airbag and a collision detector, and when the abnormality is detected, the abnormality is stored in a storage unit, and a stop sensor detects the abnormality of the vehicle. The stop state is detected, and the storage of the abnormality detected by the diagnostic circuit in the storage unit is stopped while the detection signal is output from the stop sensor.

【Example】

The invention will be described below with reference to the drawings. Figure 1 shows
It is a figure which shows one Example of this invention. First, the structure will be described. The parts indicated by reference numerals 1 to 21 are the same as those in FIG. 3, and a stop sensor 22 indicated by reference numeral 22 is newly provided in the structure shown in FIG. The stop sensor 22 is for detecting the presence or absence of the vehicle speed, and the detection output is input to the diagnostic circuit 10. While the stop sensor 22 outputs the detection output, the diagnostic circuit 10 stops the operation of storing the abnormality of the operation control circuit 20A or the collision detectors 14 to 19 in the storage unit 12. The diagnostic circuit 10 has a function of stopping the storage in the storage unit 12 as shown in FIG. 2, and outputs the ON determination unit 10a that determines whether the ignition switch 2 is ON and the stop sensor 2.
A vehicle speed determination unit 1 that determines the vehicle speed based on the output of 2
The AND circuit 10c takes the AND of the output of 0b and outputs it to the system diagnostic section 10d. Next, the operation will be described. The ignition switch 2 is turned on to charge the backup capacitor 7 with the output voltage of the DC / DC converter 5, and any one of the acceleration switches 14a to 19a of the collision detectors 14 to 19 is turned on, and the squeeze 20 is turned on. The action of generating heat to ignite the explosive and expanding the airbag, that is, the airbag expanding action by the operation control circuit 20A and the abnormality of the operation control circuit 20A or the collision detectors 14 to 19 is checked and stored in the diagnostic circuit 10. Department
The point stored in 12 is the same as the conventional example in FIG. This invention is such a conventional ignition switch 2
In addition to each operation when turning ON, the stop state of the vehicle is detected by the stop sensor 22, the detection signal from the stop sensor 22 is sent to the determination unit 10b in the diagnostic circuit 10 with the vehicle speed, Ignition switch 2 is turned on
Judge with 10a. The output of the ON determination unit 10a and the output of the vehicle speed determination unit 10b are AND
The AND is taken by the circuit 10c and output to the system diagnostic section 10d. That is, when the stop sensor 22 detects the stop state of the vehicle when the ignition switch 2 is turned on, the system diagnosis unit 10d causes the diagnosis circuit 10 to detect either the operation control circuit 20A or the collision detectors 14 to 19 during the detection. Stops storing at least one abnormality in the storage unit 12.

[Effect of device]

As described above, according to the present invention, when the abnormality is detected by checking the abnormality in at least one of the operation control circuit for deploying the airbag and the collision detector in the diagnostic circuit, the abnormality is detected. Since we decided to stop the memory while the abnormality was stored in the storage section and the stop sensor that detects the stop state of the vehicle is outputting, even if you accidentally remove the airbag harness etc. during repair, it will not be diagnosed,
Repairs other than airbags can be done with confidence. Further, there is an effect that the reliability of the data stored in the storage unit of the airbag diagnostic circuit can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an airbag system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a portion having a storage stop function in a storage portion of a diagnostic circuit in the same embodiment, and FIG. It is a block diagram of the conventional airbag system. 10 ... Diagnostic circuit, 12 ... Memory section, 14-19 ... Collision detector, 20A ... Operation control circuit, 22 ... Stop sensor.

Claims (1)

[Scope of utility model registration request] 1. A collision detector (14) mounted on a vehicle.
(19), an operation control circuit (20A) 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 detectors (14) to (19). A stop sensor (22) for detecting a stopped state of a vehicle in an airbag system including a diagnostic circuit (10) for checking an abnormality of one of the two and a storage section (12) for storing the abnormality detected by the diagnostic circuit. ) Is provided, and the storage unit (12) of the abnormality detected by the diagnostic circuit (10) while the detection signal is output from the stop sensor.
An air bag system characterized in that the diagnostic circuit (10) is provided with a function of stopping the storage in the diagnostic circuit (10).