JPH09226513A - Crew protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by interposing two resisters on a power line, the first resister on the driver protection side and the second resister on the assistant protection side, and by connecting the input line of the second DC power source of the assistant protection device to the connection between the first and the second resisters. SOLUTION: A resister 42 interposed between a switching transister 41 and an assistant protection device 45 is connected to a resister 34 in series via a power line 36. The resister 42 holds a voltage generated at the anode side of a reverse current prohibition diode 43 at a constant level not equal to zero when the switching transister 41 turns on and provides the voltage to the input side of a constant voltage circuit 44. Upon completion of diagnosis on whole parts of the driver protection device, a microcomputer 25 provides diagnosis request signal to a microcomputer 25' via a signal line X, the first communication circuit 33, the switching transister 41 and the power line 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant protection device including a plurality of airbags for protecting an occupant in the event of a vehicle collision.

[0002]

2. Description of the Related Art A conventional occupant protection device of this type will be described with reference to FIG. The booster circuit 3 boosts the input voltage from the battery 1 supplied via the ignition switch 2 and charges the backup capacitor 5 via the resistor 4. The charged electric charge is stored in the microcomputer 1
When the collision determination function of No. 1 determines a serious collision based on the acceleration signal supplied from the acceleration sensor 10, the switch circuit 7 is turned on so that the detonator 8 and the mechanical acceleration switch 9 (this Then, it is in an on state and is normally in an off state), and the detonator 8 ignites an explosive charge (not shown) to deploy the airbag. The mechanical acceleration switch 9 is
It has the structure disclosed in Japanese Patent Application No. 5-351470 filed by the present applicant.

Further, the microcomputer 11 has a failure diagnosing function. For example, when diagnosing the capacity of the backup capacitor 5, the switching transistor 13 is turned on for a predetermined time, and the electric charge charged in the backup capacitor 5 is passed through the resistor 12. When discharged, the amount of change in the terminal voltage of the backup capacitor 5 at that time is read, the capacitance is diagnosed, and if it is determined that the capacitance is different from the specified value, an alarm device such as a lamp (not shown) is used. And inform the crew. Further, the microcomputer 11 inputs the respective terminal voltages of the detonator 8 and the voltage difference between them, and when disconnection or short circuit of the detonator 8 is diagnosed and judged to be abnormal, an alarm device such as a lamp (not shown) is used. And inform the crew.

[0004]

However, recently, there has been a demand for protecting the occupant from a frontal collision of the vehicle and also protecting the occupant from a lateral collision. As a method of responding to the request, for example, the occupant protection device shown in FIG. 4 is arranged near the center console so as to cope with a collision from the front of the vehicle, and the occupant protection device similar to the occupant protection device is installed in the vehicle. It is possible to arrange it near the door so as to respond to the collision from the left and right directions, but in that case, when trying to display the diagnostic results of both occupant protection devices near the meter, more than one in the vehicle interior I have to arrange a long harness of
There was a fear that the cost would increase. In addition, an expensive connector must be used by using a plurality of harnesses, which may cause a cost increase.

The present invention has been made to solve the above problems, and an object thereof is to share a power supply line as a signal line to reduce the cost.

[0006]

A first aspect of the present invention relating to an occupant protection device is generated in association with a collision with a switch circuit connected between terminals of a first DC power source and a first series circuit including a squeeze. A main occupant protection device including a first control means having a collision determination function for ON-controlling a switch circuit of the first DC circuit based on an acceleration signal, and a power supply line from a first DC power source of the main occupant protection device. A second direct-current power supply to which power is supplied, a switch circuit connected between terminals of the second direct-current power supply, a second series circuit including a squeeze, and an acceleration signal from a direction different from the acceleration signal. A second occupant protection device having a second control means for turning on a switch circuit of a second DC circuit, and each of the main occupant protection device and the sub occupant protection device via the power supply line. Provided with a multiplex communication circuit for communicating to have, interposed the first resistor to the main passenger protection apparatus of the power supply line and the secondary passenger protection device side second
An occupant protection device, wherein a resistor is inserted and an input line of a second DC power source of the auxiliary occupant protection device is connected to a connection point of the first and second resistors.

A second invention relating to the occupant protection system is based on a first series circuit composed of a switch circuit and a squeeze connected between terminals of a first DC power source, and an acceleration signal generated upon collision. A main occupant protection device including first control means for turning on a switch circuit of the first DC circuit, and a second DC power supply to which power is supplied from a first DC power supply of the main occupant protection device through a power supply line. And a second occupant protection device that is supplied with power from a second DC power supply and that makes a collision determination based on an acceleration signal from a direction different from the acceleration signal, a switch circuit, and a detonator. And a second series circuit connected between terminals of a direct current power source, and the first and second control means communicate with each of the main occupant protection device and the sub occupant protection device via the power supply line. You Provided mux sends a collision determination result from the second control means to the first control means, first
The control circuit turns on the switch circuit of the second series circuit, and inserts a first resistor on the main occupant protection device side and a second resistor on the auxiliary occupant protection device side of the power supply line. An occupant protection device, wherein an input line of a second DC power source of the auxiliary occupant protection device is connected to a connection point of the first and second resistors.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1. The first embodiment according to the present invention will be described with reference to FIG. First, the main occupant protection device 35 will be described. That is, 21 is a booster circuit which boosts the input voltage from the battery 1 supplied via the ignition switch 2 to charge the backup capacitor 23 via the resistor 22, and also connects the switch circuit 32 and the resistor 34 in series. The boosted voltage is supplied to the auxiliary passenger protection device 45. Reference numeral 24 denotes a longitudinal acceleration sensor for detecting acceleration generated in the longitudinal direction of the vehicle. An acceleration signal as a detection signal is supplied to a microcomputer 25 described later. This microcomputer 25 has a collision determination function,
The switch circuit 2 when a serious collision is determined based on the acceleration signal supplied from the longitudinal acceleration sensor 24.
By turning on 6, backup capacitor 23
The electric charge charged in the electric field is discharged through the discharging diode 27, an ignition current is flown in series to the detonator 28 and the mechanical acceleration switch 29, and an airbag or the like is expanded.

Further, the microcomputer 25 has a function of diagnosing the backup capacitor 23, the detonator 28, etc. Among them, in the capacity diagnosis of the backup capacitor 23, the signal line Y is used immediately after the ignition switch is turned on. Then, the switching transistor 31 is turned off so that the charge stored in the backup capacitor 23 is not discharged as a dark current of each circuit of the auxiliary occupant protection device 45, that is, the auxiliary occupant protection device 4 described later.
The microcomputer 25 turns on the switching transistor 31 after the state in which 5 has no relation to act as the load of the backup capacitor 23,
By discharging the charge sufficiently charged in the backup capacitor 23 through the resistor 30 for a predetermined time, the microcomputer 25 reads the amount of change in the terminal voltage of the backup capacitor 23 at that time, and calculates the electrostatic capacitance. When the capacity is diagnosed and it is determined that there is an abnormality,
The occupant is notified using an alarm device (not shown) such as a lamp.

When the microcomputer 25 judges the disconnection of the detonator 28 based on the terminal voltage of the detonator 28 and the voltage difference between them, and if it is judged that the wire is broken, a lamp (not shown) or the like similar to the above. The occupant is informed by using the alarm device. Further, the microcomputer 25 inputs various diagnostic signals from the auxiliary occupant protection device 45 through the signal line Z, the first communication circuit 33, and the signal line X to perform the same diagnosis as above. It goes without saying that various diagnostic signals are transmitted from the microcomputer 25 ′ after transmitting the diagnostic request signal from the first communication circuit 33 to the auxiliary occupant protection device 45 via the above. In addition, reference numeral 34 in the drawing denotes a resistor inserted in a power supply line 36 between the switch circuit 32 and the input / output terminal (power supply terminal) of the main occupant protection device 35. Further, the switching transistor 41 ′ is the switching transistor 4
1 and the resistor 42 'is also equivalent to the resistor 42, and they have the same function and the same circuit configuration.

Next, the auxiliary passenger protection device 45 will be described. Reference numeral 24 'denotes the same acceleration sensor as the longitudinal acceleration sensor 24, which is different in detection method from the longitudinal acceleration sensor 24 and is attached so as to detect the lateral acceleration of the vehicle. It is a lateral acceleration sensor supplied to the computer 25 '. The microcomputer 25 'has a collision determination function similar to that of the microcomputer 25, and based on an acceleration signal supplied from the lateral acceleration sensor 24' and a switch signal supplied from an acceleration switch 40 described later. If the magnitude of the collision from the side of the vehicle is judged and if it is judged as a serious collision, the switch circuit 26 'is turned on to control the ignition current from the backup capacitor 23 of the main occupant protection device 35 to the detonator 28' via the power supply line 36. To supply.

The microcomputer 25 'has a diagnostic function similar to that of the microcomputer 25, and diagnoses, for example, disconnection of the detonator 28', and the first communication circuit 33.
In response to the diagnosis request signal from the second communication circuit 33 ′ (the same as the first communication circuit 33), the power supply line 36, the signal line Z, the first communication circuit 33, the signal line X. To the microcomputer 25 of the main occupant protection device 35. The acceleration switch 40 is composed of a semiconductor acceleration sensor and a comparison circuit for inputting a detection signal from the acceleration sensor, and outputs a switch signal when the detection output from the semiconductor acceleration sensor exceeds a reference value of the comparison circuit. To do.

Reference numeral 41 denotes a switching transistor such as a field effect transistor, which is on / off controlled by an output signal of the second communication circuit 33 '. Reference numeral 42 denotes a resistor inserted in a line (extension line of the power supply line 36) between the switching transistor 41 and the input / output terminal of the auxiliary occupant protection device 45. The resistor 42 is connected to the resistor 34 via the power supply line 36. When the switching transistor 41 turns on the voltage generated on the anode side of the backflow prevention diode 43 (or the first communication circuit 33).
Switching transistor 41 'formed on the output side of the
Is maintained at a constant voltage other than 0 level (when the switch is turned on) so that the input voltage can be constantly supplied to the constant voltage circuit 44 described later. The constant voltage circuit 4
Reference numeral 4 always receives an input voltage and supplies electric power to each circuit constituting the auxiliary passenger protection device 45.

The power line 36 is connected to the main occupant protection device 3.
When the communication is performed between the vehicle 5 and the auxiliary occupant protection device 45, the voltage waveform is as shown in FIG. That is, in FIG. 2, the voltage V1 is a value obtained by resistance-dividing the output voltage V3 of the booster circuit 21 when the switching transistor 41 is turned on by the resistors 34 and 42 (or 42 ').
2 is a voltage when the switching transistor 41 is turned off, and is determined by the value of the resistor 34.

Next, the operation of the above configuration will be described. When the diagnostic function operates, the ignition switch 2 is turned on, and the microcomputer 25 of the main occupant protection device 35 starts operating,
The microcomputer 25 turns off the switch circuit 32 via the signal line Y. After that, the microcomputer 25 turns on the switching transistor 31 for a certain period of time, and the backup capacitor 23 is turned on.
By discharging through the resistor 30 and inputting the terminal voltage of the backup capacitor 23 at that time to the microcomputer 25, the microcomputer 25 determines whether or not the electrostatic capacitance is a normal value from the voltage change of the terminal voltage of the backup capacitor 23. If it is abnormal, an alarm device is activated to notify.

After that, the microcomputer 25 diagnoses each part of the main occupant protection device 35, for example, a wire breakage or short circuit abnormality of the detonator 28, and when it is finished, the switch circuit 32.
Is turned on, and a diagnostic request signal is supplied to the microcomputer 25 'of the auxiliary occupant protection device 45 via the first communication circuit 33 and the power supply line 36. Upon receiving the diagnosis request signal, the microcomputer 25 'reads the terminal voltage of each part in the auxiliary passenger protection device 45, for example, the detonator 28', and turns on and off the switching transistor 41 by the output of the second communication circuit 33 '. That is, the signal is transmitted through the signal line Z and the first communication circuit 33 to the microcomputer 25 of the main occupant protection device 35 through the power line 36 by multiplex communication, and the microcomputer 25 performs the diagnosis.

When the collision determination function is activated When the vehicle undergoes a frontal collision such as a rear-end collision after the above-mentioned various diagnoses are completed (or not executed), the mechanical acceleration switch 29 of the main occupant protection device 35 is turned on. In addition, the microcomputer 25 uses the longitudinal acceleration sensor 24.
If it is determined that a serious collision has occurred based on the acceleration signal from the microcomputer 25, the microcomputer 25 turns on the switch circuit 26 to energize the charge charged in the backup capacitor 23 to the detonator 28 via the discharging diode 27, and the air bag, etc. To protect the occupants from a frontal collision. However, at this time, since the acceleration acts in the front-back direction of the vehicle, the left-right acceleration sensor 24 ′ of the auxiliary occupant protection device 45.
No signal is output from the acceleration switch 40, and no ignition current is supplied from the backup capacitor 23 to the primer 28 '.

When the vehicle is laterally collided,
Since the mechanical acceleration switch 29 of the main occupant protection device 35 is not turned on and the front-rear direction acceleration sensor 24 does not output an acceleration signal having a magnitude corresponding to the acceleration signal associated with the forward collision, the primer 28 is ignited. No current is supplied.

On the other hand, if the microcomputer 25 'of the auxiliary occupant protection device 45 determines that a serious collision has occurred based on the switch signal from the acceleration switch 40 and the acceleration signal from the lateral acceleration sensor 24', the microcomputer 25 '. Turns on the switch circuit 26 'to charge the backup capacitor 23 with the power line 3
6 to a primer 28 'to deploy the airbag to protect the occupant from side collisions.

Embodiment 2 Next, the second embodiment will be described with reference to FIG.
It will be described based on. In the second embodiment, the collision determination function, which is performed by the microcomputer 25 'for the one shown in FIG. 1, is transferred to the microcomputer 25 of the main occupant protection device 35, and the switch circuit 26 of the auxiliary occupant protection device 45 is used. 'Is moved to the main occupant protection device 35, and the detonator 28 of the sub occupant protection device 45' is not provided as a unit with the main occupant protection device 35, but is provided on the door, seat, etc. The harness is arranged.

Along with this, the microcomputer 25 'makes a second communication between the signal after processing the acceleration signal from the lateral acceleration sensor 24' and the signal after processing the switch signal from the acceleration switch 40. Circuit 33 '
It is necessary to constantly output the signal to the microcomputer 25 of the main occupant protection device 35 for collision determination and to turn on the switch circuit 26 'as necessary.

[0022]

As described above, according to the present invention, since power is constantly supplied to the main occupant protection device even during communication with the power supply circuit of the auxiliary occupant protection device, the circuit of the auxiliary occupant protection device has the ignition switch turned on. While being operated, the effect of being able to operate without stopping the operation is exhibited.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an occupant protection device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram of a power supply line 36 in FIG.

FIG. 3 is a circuit block explanatory diagram of a second embodiment of the occupant protection system according to the present invention.

FIG. 4 is a circuit diagram of a conventional example of the present invention.

[Explanation of symbols]

 24,24 'Acceleration sensor 25,25' Microcomputer 26,26 ', 32 Switch circuit 28,28' Detonator 33,33 'Communication circuit 34,42,42' Resistor 31,41,41 'Switching transistor 40 Acceleration switch

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[Procedure amendment]

[Submission date] March 13, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

When the microcomputer 25 judges the disconnection of the detonator 28 based on the terminal voltage of the detonator 28 and the voltage difference between them, and if it is judged that the wire is broken, a lamp (not shown) or the like similar to the above. The occupant is informed by using the alarm device. Further, the microcomputer 25 is a signal line Z, but via the first communication circuit 3 3 from the sub occupant protection device 45 to input various diagnostic signals to diagnose the same manner as described above, first through the signal traces X 1 communication circuit 33
It goes without saying that various diagnostic signals are transmitted from the microcomputer 25 'after transmitting the diagnostic request signal from the auxiliary occupant protection device 45. Reference numeral 34 in the drawing denotes a power supply line 36 between the switch circuit 32 and the input / output terminal (power supply terminal) of the main occupant protection device 35.
It is the resistance inserted in the. Further, the switching transistor 41 'is equivalent to the switching transistor 41, and the resistor 42' is also equivalent to the resistor 42, and they have the same function and have the same circuit configuration.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

The microcomputer 25 'has a diagnostic function similar to that of the microcomputer 25, and diagnoses, for example, disconnection of the detonator 28', and the first communication circuit 33.
In response to the diagnosis request signal from the main occupant protection device 35, the diagnosis result is sent via the second communication circuit 33 '(the same as the first communication circuit 33), the power supply line 36, and the signal line Z.
To the microcomputer 25. The acceleration switch 40 is composed of a semiconductor acceleration sensor and a comparison circuit for inputting a detection signal from the acceleration sensor, and outputs a switch signal when the detection output from the semiconductor acceleration sensor exceeds a reference value of the comparison circuit. To do.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

After that, the microcomputer 25 diagnoses each part of the main occupant protection device 35, for example, a wire breakage or short circuit abnormality of the detonator 28, and when it is finished, the switch circuit 32.
Is turned on, and the signal line X and the first communication circuit 3 are turned on.
3 , switching transistor 41 ', power supply line 36
The microcomputer 2 of the passenger protection device 45 via the
A diagnostic request signal is supplied to 5 '. Upon receiving the diagnosis request signal, the microcomputer 25 'reads the terminal voltage of each part in the auxiliary passenger protection device 45, for example, the detonator 28', and turns on and off the switching transistor 41 by the output of the second communication circuit 33 '. That is, the signal line to the microcomputer 25 of the main occupant protection device 35 via the power supply line 36 by multiplex communication.
It is transmitted via Z and diagnosed by the microcomputer 25.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure Amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takayuki Kishi 2-1910 Nisshin-cho, Omiya-shi, Saitama Kansei Co., Ltd. (72) Shinichiro Tsurushima, Inc. 2-1910 Nisshin-cho, Omiya-shi, Saitama Kansei Co., Ltd.

Claims (2)

[Claims] 1. A switch circuit connected between terminals of a first DC power supply, a first series circuit including a squeeze, and an ON control of a switch circuit of the first DC circuit based on an acceleration signal generated due to a collision. A main occupant protection device having a first control means having a collision determination function, a second DC power supply to which power is supplied from a first DC power supply of the main occupant protection device through a power supply line, and a second DC A switch circuit connected between terminals of the power supply, a second series circuit including a squeeze, and a second switch circuit for turning on the switch circuit of the second DC circuit based on an acceleration signal from a direction different from the acceleration signal.
A sub-passenger protection device having a control means, and a multiplex communication circuit for communicating with each of the main occupant protection device and the sub-passenger protection device via the power supply line, and A first resistor is inserted on the side of the main occupant protection device and a second resistor is inserted on the side of the auxiliary occupant protection device, and the input line of the second DC power source of the auxiliary occupant protection device is connected to the first and second resistors. An occupant protection device characterized by being connected to a connection point. 2. A switch circuit connected between terminals of a first DC power supply, a first series circuit including a squeeze, and an ON control of the switch circuit of the first DC circuit based on an acceleration signal generated in response to a collision. A main occupant protection device, a second DC power supply to which power is supplied from a first DC power supply of the main occupant protection device via a power supply line, and a power supply from a second DC power supply. A secondary occupant protection device including second control means for making a collision determination based on an acceleration signal from a direction different from the acceleration signal; and a switch circuit and a detonator connected in parallel between the terminals of the first DC power supply. And a second series circuit, and a multiplex communication circuit is provided for each of the main occupant protection device and the sub occupant protection device, the first and second control means communicating with each other via the power supply line. Control The collision judgment result from the means is transmitted to the first control means, the first control means turns on the switch circuit of the second series circuit, and the first resistance is provided to the main occupant protection device side of the power supply line. And a second resistor is inserted on the side of the auxiliary occupant protection device, and an input line of the second DC power supply of the auxiliary occupant protection device is connected to a connection point of the first and second resistors. Characteristic passenger protection device.