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START CONTROL METHOD FOR OCCUPANT CRASH PROTECTION DEVICE, START CONTROL DEVICE FOR OCCUPANT CRASH PROTECTION DEVICE, AND RECORDING MEDIUM WITH START CONTROL PROGRAM OF OCCUPANT CRASH PROTECTION DEVICE RECORDED ON IT
START CONTROL METHOD FOR OCCUPANT CRASH PROTECTION DEVICE, START CONTROL DEVICE FOR OCCUPANT CRASH PROTECTION DEVICE, AND RECORDING MEDIUM WITH START CONTROL PROGRAM OF OCCUPANT CRASH PROTECTION DEVICE RECORDED ON IT
PROBLEM TO BE SOLVED: To make a rigid distinction between a resonance and a collision of the installing bracket of an ECU resulting from an underfloor interferance and the like, and to allow to start an occupant protective device securely, only in the case necessary truely. SOLUTION: When a shock acceleration Gt more than a specific value is detected (S102), a speed integral value V is calculated (S110), and at the same time, a line segment length to the time variation of the shock acceleration is calculated (S112 and S114), And when the rate of the increase part in a specific section of the speed integral value V is smaller than a specific value R, it is decided a resonance is generated, and it is decided whether the speed integral value Vt exceeds or not a new threshold value VTH which is set (S120) at the negative side as a specific value from the threshold value VTH fixed by V (G) (S122). And when it is decided to exceed, an air bag is to be developed (S124).
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