JP4005402B2 - Airbag ignition device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an airbag ignition device, and more particularly, to an airbag ignition device including a plurality of ignition means for operating an airbag in multiple stages.
[0002]
[Prior art]
  An airbag ignition device for deploying an airbag mounted on a vehicle captures an acceleration signal at the time of a collision detected by an acceleration sensor attached to a vehicle body, and determines whether or not the airbag should be deployed. If it is determined that the airbag is to be deployed, an ignition signal is output to ignite the squib that is the ignition means, and the gas generating agent is combusted to deploy the airbag and protect the occupant from the impact during the collision. Can be done.
[0003]
  Many conventional airbag igniters are provided with only one squib as an ignition means, and in such an airbag igniter, the airbag is deployed by ignition of one squib. The airbag is suddenly deployed regardless of the impact strength such as acceleration. Therefore, in the case of a collision with a large acceleration, the occupant can be appropriately protected from a strong impact, but in the case of a collision with a small acceleration, the occupant is likely to receive an impact due to a rapid deployment of the airbag. was there.
[0004]
  In order to solve such a problem, an airbag ignition device having a plurality of squibs for operating one airbag in multiple stages has been developed.
[0005]
  By deploying one airbag with multiple squibs, for example, in the case of a collision with a large acceleration, the squib is ignited almost simultaneously to rapidly deploy the airbag, and the occupant is appropriately protected from the strong impact caused by the collision. On the other hand, in the case of a collision with a small acceleration, if the airbag is deployed rapidly in the same way, the occupant will be impacted by the rapid deployment of the airbag. By expanding the ignition time interval of the first squib, the airbag is basically deployed only with the first-stage squib, and the second and subsequent squibs are ignited at a time that does not directly affect the deployment of the airbag. In addition, it is possible to control to reduce the impact to the occupant imparted by the deployment of the airbag while suppressing the deployment speed of the airbag.
[0006]
[Problems to be solved by the invention]
  However, a conventional airbag igniter that can operate an airbag in multiple stages using a plurality of squibs is an ignition for igniting a plurality of squibs according to the magnitude of acceleration detected by a collision or the like. The signal output timing is set in advance, and the actual ignition state of the squib after the ignition signal is output is not taken into consideration.
[0007]
  Therefore, even when a malfunction occurs in one of the squibs when the airbag is activated and the squib is not ignited even though the ignition signal is output, the other squibs are dependent on the magnitude of acceleration. Thus, ignition is performed at the preset output timing. For this reason, it is impossible to compensate for the deployment operation of the airbag due to the ignited squib, the airbag cannot be operated as scheduled, and the passenger may not be properly protected from impact, which is a safety concern. There was a problem that there is a possibility that the property may be impaired.
[0008]
  In addition, after the airbag is activated, it is impossible to determine directly from the appearance whether or not all the squibs have been ignited. Therefore, there is a problem that there is a possibility that the occupant and the worker who rescues the occupant may be further shocked by such an erroneous explosion.
[0009]
  The present invention has been made in view of the above-described problems, and safety is not impaired even when a malfunction occurs in any of the plurality of ignition means at the time of multistage deployment of the airbag by the plurality of ignition means. It is another object of the present invention to provide an airbag ignition device that can appropriately control the operation of the airbag and can reliably prevent malfunctions of the plurality of ignition means due to the occurrence of a malfunction.
[0010]
[Means for solving the problems and effects thereof]
  In order to achieve the above object, an airbag ignition device (1) according to the present invention is an airbag ignition device comprising a plurality of ignition means for operating an airbag in multiple stages. Based on the ignition state detection means for detecting the state, and the ignition state of the plurality of ignition means detected by the ignition state detection means,TheMultiple ignition meansUnignited ignition meansIgnition control means for performing ignition control onIf the ignition state detection means does not detect ignition of the previous ignition means, the ignition control means, if there are a plurality of remaining unignited ignition means, ignites them simultaneously. Is to changeIt is characterized by that.
[0011]
  According to the airbag ignition device (1),By the ignition state detection means, the previous order In the case where the ignition of the first ignition means is not detected, the ignition control means changes the ignition time interval so that if there are a plurality of remaining unignited ignition means simultaneously, the remaining plurality of ignition means Control of igniting unignited ignition means at the same time can be performed, the delay of the deployment operation of the airbag due to the malfunction of the ignition means can be surely compensated, and the safety at the time of operation of the airbag is further enhanced Can do.
[0012]
  Moreover, the airbag ignition device (2)In an airbag ignition device comprising a plurality of ignition means for operating the airbag in multiple stages, an ignition state detection means for detecting an ignition state of the plurality of ignition means;When ignition of any one of the plurality of ignition means is not detected by the ignition state detection means,TheIgnition control for which ignition was not detected is controlled again.An ignition control means, and an ignition prohibiting means for prohibiting the ignition of the remaining unignited ignition means when the ignition means for which ignition has not been detected by the second ignition control by the ignition control means is not ignited. HaveIt is characterized by that.
[0013]
  According to the airbag ignition device (2), the ignition means may be able to be ignited by re-ignition control even if it is not ignited due to some trouble, and the reliability of airbag deployment control is improved. Can do. In addition, if ignition is not performed even after ignition control, it can be determined that a malfunction has occurred, and control that prevents malfunctionI.e. prohibit ignition of the remaining unignited ignition meansIt can be switched to control.Accordingly, it is possible to reliably prevent an accidental explosion after the airbag is deployed, and to ensure safety for passengers and workers during accident handling.
[0014]
  Moreover, the airbag ignition device (3) The airbag ignition device (2), The ignition prohibiting means is provided between a power source and the plurality of ignition means, and cuts off power supply to the plurality of ignition means.
[0015]
  Air bag ignition device (3), Since the electric power supply to the plurality of ignition means is cut off by the ignition prohibition means, it is possible to reliably prevent erroneous explosion of the remaining ignition means that are not ignited and to ensure safety during accident handling. can do.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of an airbag ignition device according to the present invention will be described below with reference to the drawings. FIG.Reference exampleIt is the figure which showed roughly the principal part of the airbag ignition device which concerns on (1).
[0017]
  1a in the figure₁1a₂... 1a_nIndicates squibs, respectively, 1a₁Is the first squib, 1a₂Is the second squib, 1a_nIndicates an n-th stage (n> 2) squib. First stage squib 1a₁The downstream side of the ignition transistor 2a₁Ground A₁The upstream side is connected to the ignition transistor 2b.₁And a safing sensor 3 (usually a mechanical sensor). Squibb 1a₁And ignition transistor 2b₁Connection point A between₁The squib 1a₁A line 4L for taking in a voltage value for determining whether or not the ignition is normally ignited₁To the microcomputer 10 (hereinafter referred to as a microcomputer). Ignition transistor 2a₁2b₁The gate of the line 5L for capturing the ignition signal₁Is connected to the microcomputer 10.
[0018]
  Second stage squib 1a₂The downstream side of the ignition transistor 2a₂Ground A₂The upstream side is connected to the ignition transistor 2b.₂And the safing sensor 3 are connected to the power supply circuit. Squibb 1a₂And ignition transistor 2b₂Connection point A between₂The squib 1a₂A line 4L for taking in a voltage value for determining whether or not the ignition is normally ignited₂Is connected to the microcomputer 10. Ignition transistor 2a₂2b₂The gate of the line 5L for capturing the ignition signal₂Is connected to the microcomputer 10.
[0019]
  Hereinafter, the first and second squibs 1a₁1a₂The n-th stage squib 1a has a connection configuration similar to the upstream and downstream connection configurations._n Are connected in parallel. These squibs 1a₁~ 1a_n, Ignition transistor 2a₁~ 2a_n, Ignition transistor 2b₁~ 2b_n, And line 5L₁~ 5L_nIncludes an ignition means.
[0020]
  The microcomputer 10 has a connection point A₁~ A_nLine 4L connected to₁~ 4L_nThrough the squib 1a₁~ 1a_nThe upstream voltage value is taken in, and this voltage value is taken as the reference voltage V_refCompared to squib 1a₁~ 1a_nIgnition state determination means 10b for determining the ignition state of the squib 1a determined by the ignition state determination means 10b₁~ 1a_nBased on the ignition state of the squib 1a₁~ 1a_nThe ignition signal for igniting the line 5L₁~ 5L_nIgnition transistor 2a via₁~ 2a_nAnd 2b₁~ 2b_nWhen the ignition output is not detected or the ignition of the squib which is the ignition state determination means 10b is not detected, the ignition detects the ignition time interval of the remaining squib that is scheduled to be ignited after that squib and is not yet ignited. It includes an ignition control means 10a that performs control for setting the ignition time interval longer than that of the squib that has not been performed. Line 4L₁~ 4L_nIn addition, the ignition state detection means is configured to include the ignition state determination means 10b, and the microcomputer 10 detects the occurrence of an accident by taking in the acceleration signal from the acceleration sensor 6 that outputs a signal corresponding to the acceleration. ing.
[0021]
  The squib 1a in the airbag ignition device configured as described above₁~ 1a_nThe ignition operation will be described based on the timing chart shown in FIG.
  When the vehicle collides, the safing sensor 3 is turned on in response to a change in acceleration at the time of the collision, and the microcomputer 10 that takes in the acceleration signal from the acceleration sensor 6 determines whether or not to deploy the airbag. Judging.
[0022]
  If it is determined that the airbag is to be deployed, the first stage ignition transistor 2a₁2b₁An ignition signal is output to the ignition transistor 2a₁2a₂At time t₁First stage squib 1a₁Is ignited.
[0023]
  In the ignition state determination means 10b, the line 4L₁Through the squib 1a₁The voltage value on the upstream side of the squib 1a₁The ignition state of is detected. That is, the squib 1a₁Is properly ignited, the squib 1a is ignited by ignition.₁Since the circuit is cut, the squib 1a₁No current flows downstream of the squib 1a₁Is the power supply voltage V_DDSince this voltage value is close to the reference voltage V_refBy comparing with the squib 1a₁Can be detected.
[0024]
  In the ignition control means 10a, the squib 1a is changed from the ignition state determination means 10b.₁Next, the second stage squib 1a is received.₂An ignition signal for igniting the second ignition transistor 2a₂2b₂At time t₂Second stage squib 1a₂Ignite. In the ignition state determination means 10b, the line 4L₂Through the squib 1a₂The voltage value on the upstream side of the squib 1a₂The ignition state of is detected.
[0025]
  Hereinafter, the squib 1a₁~ 1a_nIf there is no problem with the ignition of the n-stage squib 1a in the same procedure_nIgnition control up to is performed. In this way, the microcomputer 10 can squib 1a up to n stages in a predetermined order.₁~ 1a_nWhen the ignition state determination means 10b outputs the ignition detection signal for the previous squib, the control is performed so that the next squib ignition is performed.
[0026]
  On the other hand, when the ignition detection signal of the previous order squib is not output from the ignition state determination means 10b, for example, as shown in FIG._ThreeIf no ignition is detected (in the case of ignition NG), the remaining non-ignited squib 1a_Four~ 1a_nIgnition time interval for (T_Three, T_Four... T_n-1) Is squib 1a_ThreeIgnition time interval until (T₁, T₂) The remaining squib 1a is set longer and the ignition time interval is set longer._Four~ 1a_nIgnition control is performed.
[0027]
  nextReference exampleThe ignition processing operation performed by the microcomputer 10 in the airbag ignition device according to (1) will be described based on the flowchart shown in FIG. This processing operation is a processing operation performed after the microcomputer 10 determines to deploy the airbag.
[0028]
  First, in step S1, a counter X indicating the number of ignition stages of the squib is set to 1, that is, the first stage squib 1a.₁Is set to ignite, and then the process proceeds to step S2. In step S2, the X-stage squib 1a_xThe ignition signal for igniting the ignition transistor 2a_x2b_xAnd then proceed to step S3.
[0029]
  In step S3, the X-stage squib 1a_xIs detected, and then the process proceeds to step S4. In step S4, the X-stage squib 1a_xIs determined, and if it is determined that it has been ignited, the process proceeds to step S5.
[0030]
  In step S5, whether or not X is n, that is, the nth stage squib 1a._nWhether or not ignition is completed is determined. If it is determined that X is n, the process is terminated. On the other hand, if it is determined in step S5 that X is not n, the process proceeds to step S6.
[0031]
  In step S6, 1 is added to the counter X, that is, the squib to be ignited next is set._xThe ignition signal for igniting the ignition transistor 2a_x2b_xThe ignition process is repeated until the counter X reaches n.
[0032]
  On the other hand, in step S4, the X-stage squib 1a_xIf it is determined that is not ignited, the process proceeds to step S7. In step S7, it is determined whether or not ignition is not detected for the first time. If it is determined that the ignition is not the first time, it is determined that the ignition time interval has already been set long, and the process proceeds to step S5.
[0033]
  On the other hand, if it is determined in step S7 that it is the first time, the process proceeds to step S8, and in step S8, the remaining squib 1a that has not been ignited._{x + 1}~ 1a_nThe ignition time interval of the squib 1a before that₁~ 1a_xIs set to be longer than the ignition time interval, and then the process proceeds to step S5. Thereafter, the remaining squib 1a that has not been ignited_{x + 1}~ 1a_nIgnition control with a long ignition time interval is performed.
[0034]
  the aboveReference exampleAccording to the airbag ignition device according to (1), the ignition control of the squib of the next order is performed after the ignition of the squib of the previous order is detected.₁~ 1a_xCan be controlled normally in order.
[0035]
  Further, when the ignition detection signal of the previous squib is not output from the ignition state determination means 10b, the ignition time interval for the remaining squibs that have not been ignited is the ignition time interval before the squib where no ignition was detected. Therefore, the deployment speed of the airbag after the failure is detected can be suppressed, and the impact applied to the occupant due to the deployment of the airbag can be surely reduced. Thus, it is possible to quickly switch to the ignition control corresponding to the malfunction, to enhance the function of the ignition control when the malfunction is detected, and to improve the safety when the airbag is activated.
[0036]
  The aboveReference exampleIn (1), in step S8, the process of setting the ignition time interval of the remaining squib that has not been ignited is set to be long, but in another embodiment, the process of setting the ignition time interval to be short is performed. You may make it perform. By setting the ignition time interval short, the remaining squib that has not been ignited can be ignited quickly, and the delay in the airbag deployment speed due to the squib that could not be ignited can be compensated appropriately. The passengers can be properly protected from the vehicle and safety can be improved.
[0037]
  Next, the embodiment (1The airbag ignition device according to FIG. However, the embodiment (1Since the configuration of the airbag ignition device according to FIG. 2 is the same as that of FIG. 1 except for the microcomputer 10A, the ignition control means 10a of the microcomputer 10A having different functions is used.₁Are denoted by different reference numerals, and descriptions of other components having the same function are omitted here.
[0038]
  Embodiment (1) Airbag ignition deviceReference exampleThe difference from the airbag ignition device according to (1) is thatReference exampleIn (1), when ignition of a squib was not detected, the ignition time interval of the remaining squib that was scheduled to be ignited after that squib and that had not been ignited was set longer. In contrast to the embodiment (1) In the case where ignition of a squib is not detected, the remaining ignitions that are scheduled to be fired after that squib are not yet lit.pluralThe point is to control the squib to ignite simultaneously.
[0039]
  The microcomputer 10A is a squib 1a.₁~ 1a_nIgnition state determination means 10b for determining the ignition state of the squib 1a determined by the ignition state determination means 10b₁~ 1a_nBased on the ignition state of the squib 1a₁~ 1a_nThe ignition signal for igniting the lights in a predetermined order₁~ 5L_nIgnition transistor 2a via₁~ 2a_nAnd 2b₁~ 2b_nIf the ignition state determination means 10b does not detect ignition of a squib, the remaining ignition that has not yet been ignited is scheduled to be fired after that squib.pluralIgnition control means 10a for controlling ignition of the squib simultaneously₁It is comprised including.
[0040]
  The squib 1a in the airbag ignition device configured as described above₁~ 1a_nThe ignition operation will be described based on the timing chart shown in FIG.
  Time t₁₁Squibb 1a₁Is ignited, the ignition state determination means 10b generates a line 4L.₁Through the squib 1a₁The voltage value on the upstream side of the squib 1a₁The ignition state of is detected.
[0041]
  Ignition control means 10a₁Then, from the ignition state determination means 10b to the squib 1a₁Next, the second stage squib 1a is received.₂An ignition signal for igniting the second ignition transistor 2a₂2b₂At time t₁₂Second stage squib 1a₂Ignite. In the ignition state determination means 10b, the line 4L₂Through the squib 1a₂The voltage value on the upstream side of the squib 1a₂The ignition state of is detected. Hereinafter, the squib 1a₁~ 1a_nIf there is no problem with the ignition of the n-stage squib 1a in the same procedure_nIgnition control up to is performed.
[0042]
  On the other hand, when the ignition detection signal for the previous squib is not output from the ignition state determination means 10b, for example, as shown in FIG.₁₃3rd stage squib 1a_ThreeIf no ignition is detected (in the case of ignition NG), the ignition control means 10a₁The rest that are not ignitedpluralSquibb 1a_Four~ 1a_nAre simultaneously output to the fourth and subsequent ignition transistors, and time t₁₄The remaining unignitedpluralSquibb 1a_Four~ 1a_nAre controlled to ignite simultaneously.
[0043]
  Next, the embodiment (1The ignition processing operation performed by the microcomputer 10A in the airbag ignition device according to FIG. 5 will be described based on the flowchart shown in FIG. However, since the processing operation from step S1 to step S6 is the same as the processing operation shown in FIG. 3, the description thereof will be omitted here, and only a different processing operation will be described below.
[0044]
  In step S4, the X-stage squib 1a_xIs ignited, and the X-stage squib 1a is determined._xIf it is determined that is not ignited, the process proceeds to step S11. In step S11, the remaining unignitedpluralSquibb 1a_{x + 1}~ 1a_nAre simultaneously ignited, and then the process is terminated.
[0045]
  The above embodiment (1In the airbag ignition device according to FIG.₁But the remaining unignitedpluralSince control is performed so that the squib is ignited at the same time, a delay in the deployment operation of the airbag due to a malfunction of the squib can be surely compensated, and safety at the time of operation of the airbag can be further enhanced.
[0046]
  FIG. 6 shows an embodiment (2FIG. 2 is a diagram schematically showing a main part of an airbag ignition device according to FIG. 1 is different from the airbag ignition device shown in FIG.₁~ 1a_nIgnition transistor 2b upstream of the₁~ 2b_n7c between the sensor and the safing sensor 3₁~ 7c_nIs provided, and the ignition control means 10a of the microcomputer 10B having different functions is provided.₂And ignition state determination means 10b₁Are denoted by different reference numerals, and other components having the same function are denoted by the same reference numerals, and description thereof is omitted.
[0047]
  Embodiment (2The airbag ignition device according toReference exampleThe difference from the airbag ignition device according to (1) is thatReference exampleIn (1), when ignition of a squib was not detected, the ignition time interval of the remaining squib that was scheduled to be ignited after that squib and that had not been ignited was set longer. In contrast to the embodiment (2) If the ignition of a squib is not detected, control is performed to ignite the squib again. If ignition is still not detected, the ignition is scheduled to occur after that squib and has not yet been ignited. Circuit interrupting means 7c so that no remaining squib is accidentally ignited after processing.₁~ 7c_nTherefore, the circuit is opened to control the power supply to the remaining squibs.
[0048]
  The microcomputer 10B is a squib 1a.₁~ 1a_nIgnition state determination means 10b for determining the ignition state of₁And ignition state determination means 10b₁Squib 1a detected in₁~ 1a_nBased on the ignition state of the squib 1a₁~ 1a_nThe ignition signal for igniting the lights in a predetermined order₁~ 5L_nIgnition transistor 2a via₁~ 2a_nAnd 2b₁~ 2b_nControl, squib 1a₁~ 1a_nIf any of these ignitions is not detected, control to re-ignite the squib that was not ignited, and if the squib was not ignited by re-ignition control, the remaining squib that was not ignited Line 6L as a cut-off signal to cut off the power supply₁~ 6L_nCircuit breaking means 7c via₁~ 7c_nIgnition control means 10a for performing control to inhibit ignition of the remaining squib that has not been ignited₂It is comprised including.
[0049]
  Circuit breaker 7c₁~ 7c_n, Line 6L₁~ 6L_n, And ignition control means 10a₂Including an ignition prohibition means, and a circuit interruption means 7c.₁~ 7c_nFor example, a switching element such as a transistor is employed.
[0050]
  The squib 1a in the airbag ignition device configured as described above₁~ 1a_nThe ignition operation will be described based on the timing chart shown in FIG.
  Time t₂₁Squibb 1a₁Is ignited, the ignition state determination means 10b₁Then, line 4L₁Through the squib 1a₁The voltage value on the upstream side of the squib 1a₁The ignition state of is detected.
[0051]
  Ignition control means 10a₂Then, the ignition state determination means 10b₁From squib 1a₁Next, the second stage squib 1a is received.₂The ignition signal for igniting the line 5L₂Through the second stage ignition transistor 2a₂2b₂At time t_{twenty two}Second stage squib 1a₂Ignite. Ignition state determination means 10b₁Then, line 4L₂Through the squib 1a₂The voltage value on the upstream side of the squib 1a₂The ignition state of is detected. Hereinafter, the squib 1a₁~ 1a_nIf there is no problem with the ignition of the n-stage squib 1a in the same procedure_nIgnition control up to is performed.
[0052]
  On the other hand, the ignition state determination means 10b₁If the ignition detection signal for the previous squib is not output, for example, as shown in FIG._{twenty three}3rd stage squib 1a_ThreeIf no ignition is detected (in the case of ignition NG), the ignition control means 10a₂And squib 1a_ThreeIs ignited again at time t_{twenty four}Again the third stage squib 1a_ThreeIgnite.
[0053]
  By this re-ignition, the ignition state determination means 10b₁From squib 1a_ThreeWhen the ignition detection signal is output, the squib 1a_FourSubsequent ignition processing is repeated, but the squib 1a is re-ignited as shown in FIG._ThreeIf the ignition detection signal is not output, the ignition control means 10a₂Then, the remaining squib 1a which is not ignited_Four~ 1a_nThe remaining squib 1a is prevented from being ignited._Four~ 1a_nLine 6L as a cut-off signal to cut off the power supply to₁~ 6L_nCircuit breaking means 7c via₁~ 7c_nCircuit breaking means 7c_Four~ 7c_nTo open the ignition circuit, shut off the power supply, and squib 1a._Four~ 1a_nControl for forcibly prohibiting ignition of the engine is performed.
[0054]
  Next, the embodiment (2The ignition processing operation performed by the microcomputer 10B in the airbag ignition device according to FIG. 8 will be described based on the flowchart shown in FIG. However, since the processing from step S1 to step S6 is the same as the processing operation shown in FIG. 3, the description thereof will be omitted here, and only different processing operation will be described below.
[0055]
  In step S4, the X-stage squib 1a_xIs ignited, and the X-stage squib 1a is determined._xIf it is determined that is not ignited, the process proceeds to step S21. In step S21, the X-stage squib 1a that has not been ignited_xIs performed again, and the process proceeds to step S22.
[0056]
  In step S22, the X-stage squib 1a subjected to the ignition process again._xIs detected, and the process proceeds to step S23. In step S23, the X-stage squib 1a subjected to the ignition process again._xIs determined, and if it is determined that it has been ignited, the process proceeds to step S5 and the ignition process is continued.
[0057]
  On the other hand, if it is determined in step S23 that ignition has not occurred, the process proceeds to step S24. In step S24, the remaining squib 1a that has not been ignited._{x + 1}~ 1a_nCircuit breaking means 7c for inhibiting ignition of the circuit_{x + 1}~ 7c_nOutputs a cut-off signal to the circuit cut-off means 7c._{x + 1}~ 7c_nTo open the ignition circuit and squib 1a_{x + 1}~ 1a_nA process for shutting off the power supply to is performed, and then the process ends.
[0058]
  The above embodiment (2According to the airbag ignition device according to), the squib 1a₁~ 1a_nEven if one of these is not ignited due to some trouble, it can be ignited by re-ignition control, and the reliability of airbag deployment control can be improved. In addition, if ignition is not performed even after ignition control is performed again, it can be determined that a malfunction has occurred, and control can be promptly switched to control that prevents malfunction. Therefore, it is possible to reliably prevent an accidental explosion after the airbag is deployed, and to ensure safety for passengers and workers during accident processing.
[0059]
  The above embodiment (2) In the X stage squib 1a_xIs determined not to have been ignited, the X-stage squib 1a that has not been ignited_xIf the circuit is not ignited again, the circuit breaking means 7c₁~ 7c_nHowever, in another embodiment, the number of squibs that have not been ignited is counted and the count value is set to a predetermined value. When it reaches, the same processing may be performed to prohibit ignition of the remaining squib that has not been ignited.
[Brief description of the drawings]
[Figure 1]Reference exampleIt is a figure which shows roughly the principal part of the airbag ignition device which concerns on (1).
[Figure 2]Reference example5 is a timing chart for explaining the squib ignition operation in the airbag ignition device according to (1).
[Fig. 3]Reference exampleIt is a flowchart which shows the ignition processing operation | movement which the microcomputer in the airbag ignition device which concerns on (1) performs.
FIG. 4 shows an embodiment of the present invention (12 is a timing chart for explaining the squib ignition operation in the airbag ignition device according to FIG.
FIG. 5 shows an embodiment (1Is a flowchart showing the ignition processing operation performed by the microcomputer in the airbag ignition device according to FIG.
[Fig. 6] Embodiment (2It is a figure which shows schematically the principal part of the airbag ignition device which concerns on ().
FIG. 7 shows an embodiment (22 is a timing chart for explaining the squib ignition operation in the airbag ignition device according to FIG.
[Fig. 8] Embodiment (2Is a flowchart showing the ignition processing operation performed by the microcomputer in the airbag ignition device according to FIG.
[Explanation of symbols]
1a₁~ 1a_n  Squib
2a₁~ 2a_n2b₁~ 2b_n  Ignition transistor
3 Safety sensor
7c₁~ 7c_n  Circuit interruption means
10, 10A, 10B Microcomputer
10a, 10a₁10a₂  Ignition control means
10b, 10b₁  Ignition state judgment means

Claims (3)

In an airbag ignition device including a plurality of ignition means for operating an airbag in multiple stages,
Ignition state detection means for detecting an ignition state of the plurality of ignition means;
Based on the ignition state of the plurality of ignition means which is detected by the ignition state detecting means, and a ignition control means for performing ignition control for non-ignition of the ignition means of said plurality of ignition means,
When the ignition state detection means does not detect ignition of the previous ignition means, the ignition control means sets an ignition time interval so that if there are a plurality of remaining unignited ignition means, they are simultaneously ignited. An airbag ignition device characterized by being changed . In an airbag ignition device including a plurality of ignition means for operating an airbag in multiple stages,
Ignition state detection means for detecting an ignition state of the plurality of ignition means;
When the ignition of one of the ignition means of said plurality of ignition means is not detected by the ignition state detecting means, and ignition control means for the ignition to ignite controlling ignition means has not been detected again,
An ignition inhibiting means for inhibiting ignition of the remaining unignited ignition means when the ignition means for which ignition has not been detected by the ignition control means again by the ignition control means is not ignited. An air bag ignition device. The ignition prohibition means is
3. The airbag ignition device according to claim 2 , wherein the airbag ignition device is provided between a power source and the plurality of ignition means, and cuts off power supply to the plurality of ignition means.

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