JPH10166993A - Starting control device of occupant protective device and its processing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to reduce the generation of an electric noise as well as to supress the power consumption as the whole body of the device. SOLUTION: A G sensor 22 measures a shock applied to a vehicle as an acceleration, and outputs its measuring value G. A transmission permitting corcuit 26 detects whether the measuring value G from the G sensor 22 exceeds a specific standard value Gs or not. When it is detected that the measuring value G has exceeded the standard value Gs, a transmission permitting signal P is output to an I/O circuit 24. The I/O circuit 24 transmits the measuring value G to an ECU 30 through a signal line 10 only when the transmission permitting signal P is input from the transmission permitting circuit 26, and the transmission permission is given. An I/O circuit 34 inputs the transmitted measuring value to a CPU 32, and the CPU 32 carried out the starting control of an air bag device 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activation control device for controlling activation of an occupant protection device and a processing device for performing processing according to the state of a vehicle.

[0002]

2. Description of the Related Art As a device for controlling activation of an occupant protection device, there is, for example, a device for controlling ignition of a squib in an airbag device. In an airbag device, a gas generating agent is ignited by a squib in an inflator to generate gas from the inflator, and the gas is used to inflate a bag to protect an occupant.

In such an activation control device for an airbag device, for example, a satellite sensor provided at a front portion or a side portion of the vehicle detects an impact applied to the vehicle and, for example, installs the sensor on a floor tunnel. The electronic control unit (hereinafter referred to as ECU) controls the activation of the airbag device based on the detection result by the satellite sensor.

FIG. 9 is a block diagram showing an example of a conventional activation control device for performing activation control of an airbag device. The activation control device shown in FIG.
0, an ECU 130, and an airbag device 140. Among them, the satellite sensor 120 includes an acceleration sensor (hereinafter, referred to as a G sensor) 122 and an input / output circuit (hereinafter, referred to as an I / O circuit) 124.
30 is a central processing unit (hereinafter referred to as CPU) 132 and I
/ O circuit 134 is provided.

FIG. 10 shows the satellite sensor 12 shown in FIG.
FIG. 4 is an explanatory diagram showing an example of locations of the ECU 0 and an ECU 130 in the vehicle. In the example shown in FIG. 10, a front collision satellite sensor 120 </ b> F is provided at the center of the frontmost part of the vehicle 100, and the side collision satellite sensors 1 are provided on both left and right sides of the vehicle 100.
20R and 120L are provided respectively, and the vehicle 1
The ECU 130 is attached to the center of the 00.
Each satellite sensor 120F, 120R, 120
L and the ECU 130 are connected by signal lines (wire harnesses) not shown.

In the satellite sensor 120 shown in FIG. 9, a G sensor 122 measures an impact applied to the vehicle 100 as acceleration, and outputs a signal indicating the measured value. I /
The O circuit 124 transmits a signal indicating the measured value output from the G sensor 122 to the ECU 130 via the signal line 110. Since the G sensor 122 measures the impact applied to the vehicle 100 as needed, the I / O circuit 124 constantly transmits a signal indicating the measured value from the G sensor 122 to the ECU 130 via the signal line 110.

When the measured value output from the G sensor 122 is digital data,
The data is input to the O circuit 124 and transmitted. If the data is analog data, the G sensor 122 and the I / O circuit 124
, An analog / digital conversion circuit is provided to convert analog data into digital data,
The signal is input to the circuit 124 and transmitted.

On the other hand, in the ECU 130, the I / O circuit 134 inputs a signal indicating the measured value transmitted via the signal line 110 to the CPU 132. The CPU 132 obtains a calculated value based on the input measured value (ie, acceleration), compares the calculated value with a preset threshold, and calculates
The activation control of the airbag device 140 is performed based on the comparison result.

As described above, in the conventional activation control device, the impact applied to the vehicle is detected by the satellite sensor, and the activation control of the airbag device is performed by the ECU based on the detection result.

[0010]

However, in the conventional example shown in FIG. 9, a signal indicating a measured value obtained by the G sensor 122 is transmitted to the ECU 1 via a signal line 110.
Since the power is always transmitted to the power supply 30, the power consumption is increased as a whole, and the transmitted signal becomes a source of electric noise.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an activation control device for an occupant protection device capable of suppressing the power consumption of the entire device and reducing the generation of electric noise. It is in.

[0012]

In order to achieve at least a part of the above object, a first aspect of the present invention is to activate an occupant protection device mounted on a vehicle when the vehicle collides. An activation control device for controlling
A shock sensor for measuring a shock applied to the vehicle, a satellite sensor disposed at a predetermined position in the vehicle, and controlling activation of the occupant protection device based on a measurement result by the shock measuring device An activation control unit disposed at a position different from the satellite sensor unit, and a transmission unit for transmitting a signal from the satellite sensor unit to the activation control unit. The sensor unit further includes a transmission prohibiting unit that prohibits transmission by the transmission unit when a predetermined signal among the signals to be transmitted via the transmission unit does not satisfy a predetermined condition. And

As described above, in the first aspect, the satellite sensor section includes the impact measuring means for measuring the impact applied to the vehicle, and is disposed at a predetermined position in the vehicle. The activation control unit includes activation control means for controlling activation of the occupant protection device based on a measurement result by the impact measurement means, and is provided at a position different from the satellite sensor unit. The transmission means transmits a signal from the satellite sensor unit to the activation control unit. In addition, the satellite sensor unit further includes a transmission prohibiting unit that prohibits the transmission by the transmitting unit when a predetermined signal among the signals to be transmitted via the transmitting unit does not satisfy a predetermined condition.

Therefore, according to the first aspect of the invention, by providing the transmission inhibiting means, the predetermined signal is not transmitted from the satellite sensor unit to the activation control unit unless a predetermined condition is satisfied. The power is not constantly transmitted to the activation control unit via the transmission means, so that the power consumption of the entire apparatus can be suppressed accordingly, and the generation of electric noise can be reduced.

Further, in the activation control device for an occupant protection device according to the first invention, the predetermined signal is a signal indicating a measurement result by the shock measuring means, and the predetermined condition is that a shock applied to the vehicle is Preferably, the condition is that a predetermined reference value has been exceeded.

In this case, the transmission prohibiting means prohibits the transmission means from transmitting the signal indicating the measurement result by the impact measuring means while the impact applied to the vehicle does not exceed a predetermined reference value. Therefore, the signal indicating the measurement result is not transmitted to the activation control means via the transmission means unless the impact applied to the vehicle exceeds the reference value, so that the power consumption of the entire apparatus can be reduced accordingly, and The generation of electric noise can be reduced.

Further, in the activation control device for an occupant protection device according to the first invention, the satellite sensor unit further includes abnormality diagnosis means for diagnosing abnormality of the shock measurement means, and the activation control unit includes: The apparatus further includes processing means for performing a predetermined response process based on a diagnosis result by the diagnosis means, wherein the predetermined signal is a signal indicating a diagnosis result by the abnormality diagnosis means, and the predetermined condition is that the abnormality diagnosis means Preferably, the condition is that the impact measuring means is diagnosed as having an abnormality.

In this case, the transmission prohibiting unit prohibits the transmission unit from transmitting the signal indicating the diagnosis result by the abnormality diagnosing unit while the abnormality diagnosing unit diagnoses that the shock measuring unit has no abnormality. Therefore, the signal indicating the diagnosis result is
Unless the abnormality diagnosis unit diagnoses that the shock detection and measurement unit has an abnormality, the power is not transmitted to the activation control unit via the transmission unit, so that the power consumption of the entire apparatus can be reduced accordingly, and the generation of electric noise can be reduced. Can be reduced.

According to a second aspect of the present invention, there is provided a processing device mounted on a vehicle and performing a process according to a state of the vehicle, the processing device being disposed at a predetermined position in the vehicle and detecting a predetermined state of the vehicle. State detecting means, a processing means arranged at a position different from the state detecting means, and performing a predetermined process based on a detection result obtained by the state detecting means; and A transmitting means for transmitting to the processing means; and a transmitting means for inhibiting transmission of the detection result by the transmitting means when the state detecting means does not detect that the state of the vehicle has become a predetermined state. And prohibition means.

In the second invention, the state detecting means is provided at a predetermined position in the vehicle, and detects a predetermined state of the vehicle. The processing means is provided at a different position from the state detecting means, and performs a predetermined process based on a detection result obtained by the state detecting means. The transmitting means transmits the detection result from the state detecting means to the processing means. The transmission prohibiting unit prohibits transmission of the detection result by the transmitting unit when the state detecting unit does not detect that the state of the vehicle has reached a predetermined state.

As described above, according to the second aspect of the present invention, by providing the transmission inhibiting means, the detection result obtained by the state detecting means can be transmitted to the transmitting means unless the state of the vehicle becomes a predetermined state. Since no signal is transmitted to the activation control means via the transmission means, no signal is constantly transmitted to the activation control means via the transmission means.
As a result, the power consumption of the entire device can be reduced,
Further, generation of electric noise can be reduced.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples. FIG. 1 is a block diagram showing an activation control device according to a first embodiment of the present invention for performing activation control of an airbag device. The activation control device shown in FIG.
The vehicle includes a satellite sensor 20, an ECU 30, and an airbag device 40. Of these, satellite sensor 20
The ECU 30 includes a G sensor 22, an I / O circuit 24, and a transmission inhibition circuit 26. The ECU 30 includes a CPU 32 and an I / O circuit 34.
It has. The satellite sensor 20 and the ECU
In the vehicle, 30 is attached to, for example, each of the above-described locations shown in FIG.

In the satellite sensor 20 shown in FIG. 1, the G sensor 22 measures the impact applied to the vehicle as acceleration, and outputs a signal indicating the measured value G. The transmission prohibition circuit 26 receives the signal indicating the measured value G output from the G sensor 22 and detects whether the measured value G has exceeded a predetermined reference value Gs. Then, the transmission inhibition circuit 26
A transmission control signal P is output to the / O circuit 24, and when the measured value G does not exceed the reference value Gs, the signal indicating the measured value G via the signal line 10 is output. Prohibit transmission.

FIG. 2 is a characteristic diagram showing an example of a temporal change of the measured value G from the G sensor 22 and the transmission control signal P from the transmission inhibiting circuit 26 in FIG. In FIG.
(A) shows a temporal change of the measured value G, and (b) shows a temporal change of the transmission control signal P.

If the reference value Gs is set to, for example, a value as shown in FIG. 2A in the transmission prohibition circuit 26, the transmission prohibition circuit 26 determines whether the measured value G does not exceed the reference value Gs. As shown in FIG. 2B, a zero-level signal indicating transmission inhibition is output to the I / O circuit 24 as the transmission control signal P, and when the measured value G exceeds the reference value Gs, From t1, a signal of a predetermined level indicating transmission prohibition cancellation is output.

The I / O circuit 24 inputs a signal indicating the measured value G output from the G sensor 22. When the transmission control signal P input from the transmission inhibition circuit 26 is at a zero level, the transmission inhibition is inhibited. During this time, the signal indicating the measured value G is not transmitted to the ECU 30 via the signal line 10. But,
As described above, when the measured value G exceeds the reference value Gs and the transmission control signal P input from the transmission prohibition circuit 26 reaches a predetermined level, indicating that the transmission prohibition has been released, the input is performed. A signal representing the measured value G is transmitted to the ECU 30 via the signal line 10. Therefore, the satellite sensor 2
From 0, the measured value G equal to or more than the reference value Gs shown in FIG.

If the measured value output from the G sensor 22 is digital data, it is directly input to the I / O circuit 24. If the measured value is analog data, the G sensor 22 and the I / O circuit An analog / digital conversion circuit is provided between the I / O circuit 24 and the analog / digital conversion circuit.

On the other hand, in the ECU 30, the I / O circuit 3
When a signal indicating a measured value is transmitted from the satellite sensor 20 via the signal line 10, the signal 4 is input to the CPU 32. The CPU 32 obtains a calculated value based on the input measured value (ie, acceleration), compares the calculated value with a preset threshold value,
It is determined that the airbag device 40 should be activated when the calculated value exceeds the threshold value.
Output to As a result, the airbag device 40 becomes squib (not shown) inside the inflator (not shown).
Ignites the gas generating agent to generate gas from the inflator, and the gas inflates a bag (not shown) to protect an occupant in the vehicle.

FIG. 3 shows the CPU 3 in the ECU 30 shown in FIG.
6 is a flowchart illustrating a processing procedure of a startup determination interrupt process in the second embodiment. In the series of processes of the CPU 32, the above-described activation determination process is executed at regular intervals as an interrupt process as shown in FIG. When the activation determination interrupt processing is started, first, the CPU 32 inputs a signal indicating a measured value from the I / O circuit 34 (step S20). At this time, if the measured value G has not yet exceeded the reference value Gs,
Since the measured value is not transmitted from the satellite sensor 20 to the ECU 30, the CPU 32 inputs a zero-level signal as a signal indicating the measured value.
Exceeds the reference value Gs, the signal indicating the measured value has been transmitted to the ECU 30, and the CPU 32 inputs the signal indicating the transmitted measured value.

Next, the CPU 32 performs a predetermined calculation on the input measured value (ie, acceleration) to calculate a calculated value (step S22). Here, the calculated values include speed (that is, a value obtained by integrating the measured value once with respect to time), moving distance (that is, a value obtained by integrating the measured value twice with respect to time), and movement. Any one of an average (that is, a value obtained by integrating a measured value for a certain period of time), a strength of a specific frequency of the measured value, and a composite component of a vector representing the longitudinal and lateral accelerations of the vehicle, and the like. Used. The calculated value is the measured value itself (that is, the acceleration itself).
May be used. In this case, the measured value is a coefficient "1"
Is performed.

Next, the CPU 32 compares the calculated value with a preset threshold value (step S24). If the calculated value does not exceed the threshold value, the CPU 32 determines that it is not necessary to start the airbag device 40. The activation determination interrupt processing ends and the interrupt is released. However, if the calculated value exceeds the threshold value, it is determined that the airbag device 40 should be activated, and the activation signal M is output to the airbag device 40 (Step S).
26).

As described above, according to this embodiment,
By providing the transmission inhibition circuit 26 in the satellite sensor 20, the signal indicating the measured value G obtained by the G sensor 22 is transmitted to the ECU 30 via the signal line 10 unless the measured value G exceeds the reference value Gs. Therefore, the signal is not always transmitted from the satellite sensor 20 to the ECU 30 via the signal line 10, so that the power consumption of the entire apparatus can be reduced accordingly, and the generation of electric noise can be reduced. Can be reduced.

FIG. 4 is a block diagram showing a start control device according to a second embodiment of the present invention for performing start control of the airbag device. The activation control device shown in FIG. 4 includes a satellite sensor 50, an ECU 30, an airbag device 40,
It has. Of these, the satellite sensor 50 is G
A CPU 58 is provided in addition to the sensor 52 and the I / O circuit 54. Then, the CPU 58 functions as a level determining unit 58a.

In the satellite sensor 50 shown in FIG. 4, similarly to the G sensor 22 shown in FIG. 1, the G sensor 52 measures the impact applied to the vehicle as acceleration, and inputs a signal indicating the measured value to the CPU 58. At this time, if the measured value output from the G sensor 52 is digital data, it is input to the CPU 58 as it is, but if it is analog data, the G sensor 52 and the CPU 58
An analog / digital conversion circuit is provided between the CPU and the CPU to convert analog data into digital data.
58.

The level discriminator 58a of the CPU 58 obtains a calculated value based on the input measured value (ie, acceleration), and converts the calculated value into a plurality of predetermined thresholds (levels).
Are compared with each other to determine which level the operation value has exceeded, and the result of the determination is output as a level determination signal. In this case, the level discriminator 58a outputs a level discrimination signal to the I / O circuit 54 only when the operation value exceeds the set level, and outputs a signal while the operation value does not exceed the set level. No signal is output to the I / O circuit 54 in order to inhibit the transmission of the signal via the line 10.

Therefore, the I / O circuit 54 transmits the level determination signal to the ECU 30 via the signal line 10 only when the level determination signal is output from the level determination section 58a.

On the other hand, in the ECU 30, the I / O circuit 3
4 inputs the level discrimination signal transmitted through the signal line 10 to the CPU 32. The CPU 32 controls the activation of the airbag device 40 based on the input level determination signal.

As described above, according to this embodiment,
A CPU 58 functioning as a level discriminator 58a is provided in the satellite sensor 50, and outputs no signal to the I / O circuit 54 while the calculated value does not exceed the set level. By prohibiting transmission of signals via the signal line 10, signals are not always transmitted from the satellite sensor 20 to the ECU 30 via the signal line 10, so that the power consumption of the entire apparatus can be suppressed and the noise of electric noise can be reduced. The occurrence can be reduced.

In this embodiment, the satellite sensor 5
At 0, the CPU 58 functions as the level determining unit 58a that determines the level based on the measured value. Alternatively, the CPU 58 may function as an activation determining unit that determines the activation.

That is, the activation discriminating unit obtains a calculated value based on the input measured value, compares the calculated value with a predetermined threshold, and when the calculated value exceeds the threshold, the airbag device. Should be activated, and an activation signal is output to the I / O circuit 54. As long as the calculated value does not exceed the threshold, no signal is output to the I / O circuit 54 in order to prohibit transmission of the signal via the signal line 10. I
When an activation signal is output from the activation determination unit, the / O circuit 54 transmits the activation signal from the satellite sensor 50 to the signal line 1.
0 to the ECU 30 and the CPU 3 of the ECU 30
Enter 2 The CPU 32 activates the airbag device 40 based on the input activation signal.

Now, in the embodiment shown in FIG.
Although the PU 58 functions only as the level determination unit 58a, the CPU 58 may have a function as an abnormality diagnosis unit that performs abnormality diagnosis of a G sensor or the like. However, in such a case, in order to notify the ECU of the diagnosis result obtained by the abnormality diagnosis unit, a signal indicating the diagnosis result is always transmitted to the ECU via a signal line. Problems similar to those in technology will arise. Therefore, next, an embodiment capable of solving such a problem will be described.

FIG. 5 is a block diagram showing a start control device according to a third embodiment of the present invention which performs start control of the airbag device. The activation control device shown in FIG. 5 includes a satellite sensor 50 ′, an ECU 60, and an airbag device 40.
And a warning lamp 70.

Of these, the satellite sensor 50 '
In addition to the sensor 52 and the I / O circuit 54, a CPU 58 'and a transmission inhibiting circuit 56 are provided.
And an I / O circuit 64 and a memory 66.

The CPU in the satellite sensor 50 '
Reference numeral 58 'functions as a level determination unit 58a and an abnormality diagnosis unit 58b, and the CPU 62 in the ECU 60 functions as a start-up control processing unit 62a and a diagnosis processing unit 62b.

In the satellite sensor 50 shown in FIG. 5, the G sensor 52 measures the impact applied to the vehicle as acceleration as described with reference to FIG. 4, and outputs a signal indicating the measured value to C.
Input to PU58 '.

The level discriminator 58a of the CPU 58 'obtains a calculated value from the input measured value and compares the calculated value with a threshold value, as described in the embodiment of FIG.
It determines which level the operation value has exceeded, and outputs the result of the determination as a level determination signal. Then, the level determination section 58a outputs a level determination signal to the I / O circuit 54 only when the calculated value exceeds the set level, and does not output any signal while the calculated value does not exceed the set level. To do. The I / O circuit 54 includes a level determining unit 58a
Only when a level discrimination signal is output from the controller 60, the level discrimination signal is transmitted to the ECU 60 via the signal line 10.

On the other hand, in the ECU 60, the I / O circuit 6
When a level discrimination signal is transmitted from the satellite sensor 50 'via the signal line 10, the level discrimination signal 4 is input to the CPU 62. The activation control processing unit 62a of the CPU 62 performs the following based on the input level determination signal.
The activation control of the airbag device 40 is performed.

Further, in the satellite sensor 50 ',
The abnormality diagnosing unit 58b of the CPU 58 'constantly diagnoses whether there is any abnormality in the G sensor 52 or the like, and outputs the diagnosis result as a diagnosis signal D. The transmission inhibition circuit 56 receives the diagnostic signal D output from the abnormality diagnosing section 58b, and detects from the diagnostic signal D whether the G sensor 52 or the like is diagnosed as having an abnormality. Then, the transmission inhibition circuit 56
A transmission control signal P is output to the O circuit 54, and the transmission of the diagnostic signal D via the signal 10 is performed while the transmission control signal P determines that the G sensor 52 and the like have no abnormality. Ban.

FIG. 6 is a characteristic diagram showing an example of the temporal change of the diagnostic signal D from the abnormality diagnostic section 58b and the transmission control signal P from the transmission inhibiting circuit 56 in FIG. In FIG. 6, (a) shows a temporal change of the diagnostic signal D,
(B) shows a temporal change of the transmission control signal P.

The abnormality diagnosing section 58b outputs a zero-level signal as the diagnostic signal D when it is diagnosed that there is no abnormality in the G sensor 52 or the like. Outputs a signal of a predetermined constant level Dh (> 0) as the diagnostic signal D. Therefore, for example, at a certain time point t2, an abnormality occurs in the G sensor 52,
When the abnormality diagnosis unit 58b diagnoses that there is an abnormality, FIG.
As shown in (a), the diagnostic signal D changes from the zero level to the constant level Dh at the time point t2.

Therefore, the transmission inhibiting circuit 56 outputs the diagnostic signal D
6 is zero level, indicating that there is no abnormality.
As shown in (b), a zero-level signal indicating transmission prohibition is output to the I / O circuit 54 as the transmission control signal P, and when the diagnostic signal D becomes a constant level Dh and indicates that there is an abnormality, From the time point t2, a signal of a predetermined level indicating transmission prohibition cancellation is output.

On the other hand, the I / O circuit 54 not only outputs the level discrimination signal output from the level discrimination section 58a, but also
The diagnostic signal D output from the abnormality diagnostic section 58b is also input. As described above, the level discrimination signal is transmitted to the ECU 60 via the signal line 10 only when output from the level discrimination unit 58a, but the transmission control signal from the transmission prohibition circuit 56 is transmitted for the diagnostic signal D. Based on P, it is transmitted to the ECU 60 as follows. That is, while the transmission control signal P from the transmission prohibition circuit 56 is at the zero level and indicates that transmission is prohibited, the diagnostic signal D is output to the signal line 1.
0 is not transmitted to the ECU 60. However, as described above, if the transmission prohibition signal P from the transmission prohibition circuit 56 becomes a predetermined level due to the abnormality diagnosis unit 58b diagnosing the presence of the abnormality, and the transmission prohibition signal is released, The input diagnostic signal D is transmitted through the signal line 10 to the ECU.
Transmit to 60. Therefore, a signal of a certain level Dh indicating abnormality is transmitted from the satellite sensor 50 'to the ECU 60 as the diagnostic signal D.

In the ECU 60, the I / O circuit 6
When a diagnostic signal is transmitted from the satellite sensor 50 'via the signal line 10, the diagnostic signal is transmitted to the CP.
Input to U62. On the other hand, the memory 66 stores the G sensor 52
And the like (that is, whether or not there is an abnormality, etc.).
When the diagnostic processing unit 62b of the PU 62 determines that the G sensor 52 or the like has an abnormality based on the input diagnostic signal, the diagnostic processing unit 62b changes the state of the G sensor 52 or the like stored in the memory 66 (that is, from the absence of an abnormality). At the same time, the warning lamp 70 indicating that there is an abnormality in the G sensor 52 or the like is turned on.

Here, the procedure of a comprehensive diagnosis process executed by the diagnosis processing unit 62b of the CPU 62 will be described. FIG. 7 is a flowchart showing a procedure of a diagnostic process of the diagnostic processing unit 62b in the CPU 62 shown in FIG. FIG.
As shown in (5), when an ignition switch (not shown) in the vehicle is turned on and a power supply circuit (not shown) in the vehicle is activated, the diagnostic processing unit 62b first performs a primary check (step S30). In this primary check, diagnostic items confirmed at the time of power-on (that is, diagnostic items that must be viewed only at the time of power-on) are checked.

Next, the diagnostic processing section 62b is provided with the I / O circuit 3
4 (step S32), and checks whether there is any abnormality in the G sensor 52 or the like. At this time, if there is no abnormality in the G sensor 52 and the like, the diagnostic signal is not transmitted from the satellite sensor 50 to the ECU 60, and there is no signal to be input as a diagnostic signal to the diagnostic processing unit 62b. Processing unit 62
b can recognize that there is no abnormality in the G sensor 52 and the like. Conversely, if the G sensor 52 or the like is abnormal, the ECU
Since the diagnostic signal has been transmitted to 60, the diagnostic processing unit 62
b inputs the transmitted diagnostic signal and can recognize from the diagnostic signal that there is an abnormality in the G sensor 52 or the like.

Next, the diagnostic processing unit 62b constantly checks (step S34). In this constant check,
The diagnostic items confirmed after the primary check is completed (that is, diagnostic items that must be constantly viewed) are checked.

After the primary check is completed, the processes of steps S32 and S34 are repeatedly executed.

As described above, according to the present embodiment,
By providing the transmission inhibition circuit 56 in the satellite sensor 50 ', the diagnostic signal D obtained by the abnormality diagnosing unit 58b causes the signal line 10 to be connected to the signal line 10 unless the abnormality diagnosing unit 58b diagnoses that the G sensor 52 or the like has an abnormality. ECU 60 via
Not transmitted to The level determination signal is also transmitted to the ECU 60 only when output from the level determination unit 58a. Therefore, since no signal is constantly transmitted from the satellite sensor 50 'to the ECU 60 via the signal line 10, the power consumption of the entire apparatus can be reduced, and the generation of electric noise can be reduced. it can.

In the embodiment shown in FIG. 5, the start determination process and the diagnosis process by the CPU 62 in the ECU 60 are described separately. For example, the CPU 62 has a dedicated port called input capture or UART. In such a case, the following processing can be performed. That is, when a signal transmitted from the satellite sensor 50 'to the ECU 60 is input using the above-described dedicated port, the CPU 62 can be interrupted by the input of the signal. Such interrupt processing can be performed.

FIG. 8 is a flow chart showing the processing procedure of the interrupt processing when a signal from the satellite sensor 50 'is input using a dedicated boat. As shown in FIG.
When the interrupt process is started, first, the CPU 62 captures an input signal (step S40). Next, CPU
62 determines whether the received signal is a diagnostic signal or a level determination signal (step S42). If the signal is a level determination signal, the above-described activation determination processing is performed based on the signal (step S44). If the signal is a diagnostic signal, a series of processing is performed based on the signal when it is determined that there is an abnormality as described above (step S4).
6). Thereafter, in both cases, the interrupt processing is terminated and the hardware interrupt is released.

The present invention is not limited to the above-described examples and embodiments, but can be implemented in various modes without departing from the gist thereof.

In the above embodiment, the airbag device 40 is used as the occupant protection device. However, in addition to the airbag device, for example, a seat belt device with a pretensioner, an inflator pull curtain device, Sometimes, a device for stopping the supply of fuel to the engine or a device for releasing the door lock in the event of a collision can be used.

Although the above-described embodiment is an apparatus for controlling activation of an occupant protection device such as an airbag device, the present invention is not limited to these devices.
The present invention can be applied to various processing devices mounted on a vehicle. That is, state detecting means for detecting a predetermined state of the vehicle such as a satellite sensor, processing means for performing a predetermined process based on a detection result such as an ECU, and a signal line connecting the satellite sensor and the ECU. The present invention can be applied to any processing device that includes at least a transmission unit that transmits a detection result.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an activation control device according to a first embodiment of the present invention for performing activation control of an airbag device.

FIG. 2 is a characteristic diagram showing an example of a temporal change of a measured value G from a G sensor 22 and a transmission inhibition signal P from a transmission inhibition circuit 26 in FIG.

FIG. 3 is a flowchart showing a processing procedure of a start determination interruption process in a CPU 32 in an ECU 30 shown in FIG.

FIG. 4 is a block diagram showing an activation control device according to a second embodiment of the present invention for performing activation control of an airbag device.

FIG. 5 is a block diagram showing an activation control device according to a third embodiment of the present invention for performing activation control of an airbag device.

6 is a characteristic diagram illustrating an example of a temporal change of a diagnostic signal D from an abnormality diagnostic unit 58b and a transmission inhibition signal P from a transmission inhibition circuit 56 in FIG. 5;

7 is a diagnostic processing unit 62 in the CPU 62 shown in FIG.
It is a flowchart which shows the processing procedure of the diagnostic processing of b.

FIG. 8 is a flowchart showing a processing procedure of an interrupt process when a signal from a satellite sensor 50 'is input using a dedicated boat.

FIG. 9 is a block diagram illustrating an example of a conventional activation control device that performs activation control of an airbag device.

FIG. 10 shows a satellite sensor 120 and an EC shown in FIG.
It is explanatory drawing which shows an example of the arrangement | positioning place in the vehicle of U130.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Signal line 20 ... Satellite sensor 22 ... G sensor 24 ... I / O circuit 26 ... Transmission inhibition circuit 30 ... ECU 32 ... CPU 34 ... I / O circuit 40 ... Airbag device 50, 50 '... Satellite sensor 52 ... G Sensor 54 ... I / O circuit 56 ... Transmission prohibition circuit 58,58 '... CPU 58a ... Level discriminating unit 58b ... Abnormal diagnosis unit 60 ... ECU 62 ... CPU 62a ... Start-up control processing unit 62b ... Diagnosis processing unit 64 ... I / O Circuit 66 ... Memory 70 ... Warning lamp 100 ... Vehicle 110 ... Signal line 120 ... Satellite sensor 120F ... Front collision satellite sensor 120R, 120L ... Side collision satellite sensor 122 ... G sensor 124 ... I / O circuit 130 ... ECU 132 ... CPU 134: I / O circuit 140: Airbag device G: Measured value D: Diagnostic signal h ... certain level M ... starting signal P ... transfer prohibited signal

Claims (4)

[Claims] 1. An activation control device for controlling activation of an occupant protection device mounted on a vehicle when the vehicle collides, comprising: an impact measurement unit configured to measure an impact applied to the vehicle; A satellite sensor unit disposed at a predetermined position in the vehicle, and activation control means for controlling activation of the occupant protection device based on a measurement result obtained by the impact measurement means, and a position different from the satellite sensor unit And a transmission unit that transmits a signal from the satellite sensor unit to the activation control unit. The satellite sensor unit transmits a signal to be transmitted via the transmission unit. Of the predetermined signals, if the predetermined conditions are not satisfied,
An activation control device for an occupant protection device, further comprising a transmission prohibiting unit that prohibits transmission by the transmitting unit. 2. The start control device for an occupant protection device according to claim 1, wherein the predetermined signal is a signal indicating a result of measurement by the shock measuring means, and the predetermined condition is a shock applied to the vehicle. Is a condition that the predetermined value exceeds a predetermined reference value. 3. The activation control device for an occupant protection device according to claim 1, wherein the satellite sensor unit further includes abnormality diagnosis means for performing abnormality diagnosis of the shock measurement means, and the activation control unit includes: The apparatus further includes processing means for performing a predetermined response process based on a diagnosis result by the abnormality diagnosis means, wherein the predetermined signal is a signal indicating a diagnosis result by the abnormality diagnosis means, and the predetermined condition is the abnormality diagnosis. A starting control device for an occupant protection device, characterized in that the condition is that the means has diagnosed that the shock measuring means is abnormal. 4. A processing device mounted on a vehicle and performing a process according to a state of the vehicle, wherein the state detection means is disposed at a predetermined position in the vehicle and detects a predetermined state of the vehicle. Processing means arranged at a position different from the state detecting means and performing a predetermined process based on a detection result obtained by the state detecting means; and transmitting the detection result from the state detecting means to the processing means. A transmission unit that transmits, and a transmission prohibition unit that prohibits transmission of the detection result by the transmission unit when the state detection unit does not detect that the state of the vehicle has reached a predetermined state. A processing device in a vehicle comprising: