Actuation controller for air bag device
First Claim
1. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
- a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a first predetermined velocity threshold value (Vs1) provided as a function of time, and when said integrated value difference is not smaller than said threshold value (Vd≧
Vs1), said inflators being activated in accordance with a separately selected inflator activation mode.
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Accused Products
Abstract
In an air bag system of the type that inflates one air bag using a plurality of inflators, an air bag inflation control apparatus is provided that can make a proper determination of inflator activation mode and a correct decision to activate or not activate the inflators according to the severity of a collision. More specifically, the invention provides an activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of the inflators in accordance with the severity of the collision, comprising: a first acceleration sensor 1, mounted in a position within a passenger compartment, for constantly detecting acceleration G at the mounting position; and a second acceleration sensor 2, mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration G′ at the mounting position, and wherein: a decision to activate or not activate the plurality of inflators and determination of the activation mode of the inflators are determined by utilizing differences in characteristics among various values in various types of collision and by combining the various values as appropriate, the various values consisting of a first time-integrated value V1 obtained by performing time integration based on an acceleration signal from the first acceleration sensor 1 and a second time-integrated value V1′ obtained by performing time integration based on an acceleration signal from the second acceleration sensor 2, and of an integrated value difference between the second time-integrated value and the first time-integrated value, Vd=V1′−V1, or the amount of change of the integrated value difference, (Gd=d(Vd)/dt).
50 Citations
40 Claims
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1. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a first predetermined velocity threshold value (Vs1) provided as a function of time, and when said integrated value difference is not smaller than said threshold value (Vd≧
Vs1), said inflators being activated in accordance with a separately selected inflator activation mode.- View Dependent Claims (2, 3, 4)
-
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5. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a first predetermined velocity threshold value (Vs1) provided as a function of time, and when said integrated value difference is not smaller than said threshold value (Vd≧
Vs1), said inflators being activated in accordance with a separately selected inflator activation mode, the amount of change (Gd) of said integrated value difference being compared with a predetermined difference change threshold value (Gs) provided as a function of time, and when said amount of change is not smaller than said threshold value (Gd≧
Gs), said inflators being activated in accordance with a separately selected inflator activation mode.
-
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6. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a fifth predetermined velocity threshold value (Vs5) set as a function of said first time-integrated value (V1), and when said integrated value difference is not smaller than said fifth velocity threshold value (Vd≧
Vs5), said inflators being activated in accordance with a separately selected inflator activation mode.
-
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7. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with said first velocity threshold value (Vs1) and the amount of change (Gd) of said integrated value difference being compared with said difference change threshold value (Gs), and when either one or two conditions, one requiring that said integrated value difference be not smaller than said first velocity threshold value (Vd≧
Vs1) and the other requiring that said amount of change of said integrated value difference be not smaller than said difference change threshold value (Gd≧
Gs), or both of said two conditions are satisfied, said inflators being activated in accordance with a separately selected inflator activation mode.
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8. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a fifth predetermined velocity threshold value (Vs5) set as a function of said first time-integrated value (V1), and when said integrated value difference is not smaller than said fifth velocity threshold value (Vd≧
Vs5), said inflators being activated in accordance with a separately selected inflator activation mode.
-
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9. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with said fifth velocity threshold value (Vs5) and the amount of change (Gd) of said integrated value difference being compared with said difference change threshold value (Gs), and when either one of two conditions, one requiring that said integrated value difference be not smaller than said fifth velocity threshold value (Vd≧
Vs5) and the other requiring that said amount of change of said integrated value difference be not smaller than said difference change threshold value (Gd≧
Gs), or both of said two conditions are satisfied, said inflators being activated in accordance with a separately selected inflator activation mode.
-
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10. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d (Vd)/dt), said second time-integrated value (V1′
) being compared with a sixth predetermined velocity threshold value (Vs6) set as a function of said first time-integrated value (V1), and when said second time-integrated value is not smaller than said sixth velocity threshold value (V1′
≧
Vs6), said inflators being activated in accordance with a separately selected inflator activation mode.
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11. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said second time-integrated value (V1′
) being compared with a sixth predetermined velocity threshold value (Vs6) set as a function of said first time-integrated value (V1) and said amount of change (Gd) of said integrated value difference being compared with said difference change threshold value (Gs), and when either one of two conditions, one requiring that said second time-integrated value is not smaller than said sixth velocity threshold value (V1′
≧
Vs6) and the other requiring that said amount of change of said integrated value difference be not smaller than said difference change threshold value (Gd≧
Gs), or both of said two conditions are satisfied, said inflators being activated in accordance with a separately selected inflator activation mode.
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12. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said integrated value difference (Vd) being compared with a second predetermined velocity threshold value (Vs2) provided as a function of time, and the activation mode of said inflators being determined based on the result of said comparison.- View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), said second time-integrated value (V1′
) being compared with a third predetermined velocity threshold value (Vs3) provided as a function of time, and the activation mode of said inflators being determined based on the result of said comparison.
-
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20. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), computations are started at time (t0) when the acceleration value (G) of said first acceleration sensor (1) exceeds a predetermined acceleration value (G1) and at time (t0′
) when the acceleration value (G′
) of said second acceleration sensor (2) exceeds a predetermined acceleration value (G1′
).- View Dependent Claims (21, 22)
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23. An activation control apparatus for an air bag system having a plurality of inflators for one air bag, which, upon detection of a vehicle collision, controls activation of said inflators in accordance with the severity of said collision, comprising:
-
a first acceleration sensor (1), mounted in a position within a passenger compartment, for constantly detecting acceleration (G) at said mounting position; and
a second acceleration sensor (2), mounted in a position within a crush zone in a forward part of a vehicle, for constantly detecting acceleration (G′
) at said mounting position, and wherein;
a decision as to whether to activate or not activate said plurality of inflators and determination of an activation mode of said inflators are made by utilizing differences in characteristics among various values in various types of collision and by combining said various values as appropriate, said various values consisting of a first time-integrated value (V1) obtained by performing time integration based on an acceleration signal from said first acceleration sensor (1) and a second time-integrated value (V1′
) obtained by performing time integration based on an acceleration signal from said second acceleration sensor (2), and of an integrated value difference between said second time-integrated value and said first time-integrated value (Vd=V′
−
V) or the amount of change of said integrated value difference (Gd=d(Vd)/dt), the activation mode of said inflators being determined by performing a prescribed computation based on the acceleration signal (G′
) from said second acceleration sensor (2), and whether to activate or not activate said inflators being determined by performing a prescribed computation based on the acceleration signal (G) from said first acceleration sensor (1).- View Dependent Claims (24, 31, 33, 34, 35, 36, 37, 38, 39, 40)
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25. An activation control apparatus for an air bag system as claimed in 23, wherein said second time-integrated value (V1′
- ), obtained by performing time integration based on the acceleration signal (G′
) from said second acceleration sensor (1′
), is compared with an eighth predetermined velocity threshold value (Vs8) indicative of the degree of collision severity, and when said second time-integrated value is smaller than said eighth velocity threshold value (V1′
<
Vs8), an inflator activation mode for inflating said air bag at a moderate speed is selected, while on the other hand, when said second time-integrated value is not smaller than said eighth velocity there should value (V1≧
Vs8), an inflator activation mode for rapidly inflating said air bag is selected. - View Dependent Claims (26, 27, 28, 29, 30)
- ), obtained by performing time integration based on the acceleration signal (G′
-
32. An activation control apparatus for an air bag system as claimed in 23, wherein said second time-integrated value (V1′
- ) is compared with an 11th predetermined velocity threshold value (Vs11) indicative of the degree of collision severity, and when said second time-integrated value is not smaller than said 11th velocity threshold value (V1′
≧
Vs11), an inflator activation mode for causing said air bag to inflate rapidly is selected, while on the other hand, when said second time-integrated value is smaller than said 11th velocity threshold value (V1′
<
Vs11), then said second time-integrated value (V1′
) is further compared with an eighth predetermined velocity threshold value (Vs8), and if said second time-integrated value is smaller than said eighth velocity threshold value (V1′
<
Vs8), an inflator activation mode for causing said air bag to inflate at a moderate speed is selected, but if second time-integrated value is not smaller than said eighth velocity threshold value (V1′
≧
Vs8), an inflator activation mode for causing said air bag to inflate rapidly is selected, and wherein the value of said 11th velocity threshold value (Vs11) is set higher than the value of said eighth velocity threshold value (Vs8), and said second time-integrated value (V1′
) is compared with said eighth velocity threshold value (Vs8) after an elapsed time (t′
) from the starting of the computation based on said second acceleration sensor (2) has reached a predetermined time (ts).
- ) is compared with an 11th predetermined velocity threshold value (Vs11) indicative of the degree of collision severity, and when said second time-integrated value is not smaller than said 11th velocity threshold value (V1′
Specification