START CONTROLLING METHOD FOR A PASSENGER PROTECTION SYSTEM, START CONTROLLING SYSTEM FOR A PASSENGER PROTECTION SYSTEM, AND RECORDING MEDIUM FOR RECORDING A START CONTROLLING PROGRAM FOR A PASSENGER PROTECTION SYSTEM

摘要

If deceleration in excess of a predetermined value is detected (step 104 in FIG. 2), a speed integral value DELTAV as time integration of the deceleration is calculated (step 110 in FIG. 2). A segment length of a characteristic curve of the speed integral value DELTAV in a predetermined range is calculated (steps 112, 114 in FIG. 2) . If it is decided that the segment length is smaller than a predetermined value l2 (step 116 in FIG. 2), the crash is decided as the low speed crash, etc. other than a soft crash. An air bag is inflated if the speed integral value DELTAV exceeds a predetermined threshold value VTH, whereas the speed integral value DELTAV is incremented by a predetermined value alpha (step 118 in FIG. 2) if it is decided that the segment length exceeds l2 (step 116 in FIG. 2). Then, if it is decided that the speed integral value DELTAV exceeds the threshold value VTH (step 112 in FIG. 2), inflation of the air bag is executed to detect generation of the soft crash.