Abstract: A vehicle occupant protection apparatus 1 including: a first acceleration sensor (2) for detecting acceleration of a front portion of a vehicle (10); a second acceleration sensor 3 for detecting acceleration of a central portion; a integral initiation control device (15) for issuing an integral initiation command; the first acceleration integral device (16) for obtaining a first integral acceleration value of the acceleration of the front portion based on the integral initiation command; the second acceleration integral device (17) for obtaining a second integral acceleration value of the acceleration of the central portion based on the integral initiation command; a subtraction device (18) for calculating a difference between the first and second integral acceleration values; and the initiation determining device (20) for determining a type of the collision using the deference and starting an operation of the vehicle protection device (6) based on the determined type of the collision.

Abstract: An anterior part of a vehicle is provided with a bumper armature as a structural member having high rigidity. A bumper is disposed front of the bumper armature, and a radiator and an engine are disposed behind the bumper armature. A collision determining device embedded with an acceleration sensor as an airbag development control apparatus is arranged in a position approximately in the center of a vehicle interior. A time period “t” during when a signal waveform curve outputted from the acceleration sensor reaches from a first threshold value to a second threshold value is measured to judge whether or not the time period “t” is equal to or less than a previously set time “s”. When t?s satisfied, full development of an airbag in which both of inflators are activated is selected by determining that the collision is occurred under a high speed condition.

Abstract: An air-bag deployment system includes a first acceleration sensor provided in a front side portion of a vehicle body, a second acceleration sensor provided in a passenger compartment, an air-bag deployment judging device and an air-bag deployment device for deploying an air bag. The air-bag deployment judging device executes a first deployment judgment using primarily the first acceleration signal to output a deployment allowance signal ON and a second deployment judgment using primarily the second acceleration signal to output a deployment signal ON. An allowance judging part receives data abnormality signal from a data abnormality judging part and outputs a deployment allowance signal ON when the judging part receives the data abnormality signal ON. An ignition signal ON is outputted from an AND logical operator when both of the deployment allowance signal and the deployment signal are ON.

Abstract: An anterior part of a vehicle is provided with a bumper armature as a structural member having high rigidity. A bumper is disposed front of the bumper armature, and a radiator and an engine are disposed behind the bumper armature. A collision determining device embedded with an acceleration sensor as an airbag development control apparatus is arranged in a position approximately in the center of a vehicle interior. A time period “t” during when a signal waveform curve outputted from the acceleration sensor reaches from a first threshold value to a second threshold value is measured to judge whether or not the time period “t” is equal to or less than a previously set time “s”. When t?s satisfied, full development of an airbag in which both of inflators are activated is selected by determining that the collision is occurred under a high speed condition.

Abstract: A vehicle occupant protection apparatus 1 including: a first acceleration sensor (2) for detecting acceleration of a front portion of a vehicle (10); a second acceleration sensor 3 for detecting acceleration of a central portion; a integral initiation control device (15) for issuing an integral initiation command; the first acceleration integral device (16) for obtaining a first integral acceleration value of the acceleration of the front portion based on the integral initiation command; the second acceleration integral device (17) for obtaining a second integral acceleration value of the acceleration of the central portion based on the integral initiation command; a subtraction device (18) for calculating a difference between the first and second integral acceleration values; and the initiation determining device (20) for determining a type of the collision using the deference and starting an operation of the vehicle protection device (6) based on the determined type of the collision.