Activation device for passenger protection apparatus
First Claim
1. An activation device for a passenger protection apparatus which is made to activate said passenger protection apparatus in accordance with a behavior of a vehicle, comprising:
- an angular velocity sensor for detecting a roll angular velocity of said vehicle;
relative angle calculating means for calculating a roll relative angle of said vehicle on the basis of the roll angular velocity detected by said angular velocity sensor;
roll judging means for making a judgment indicating the occurrence of a roll of said vehicle when the roll angular velocity detected by said angular velocity sensor and the vehicle roll relative angle calculated by said relative angle calculating means satisfy a predetermined threshold condition;
drive control means for activating said passenger protection apparatus when said roll judging means makes the vehicle roll judgment;
a plurality of acceleration sensors for detecting accelerations of said vehicle in lateral directions;
collision state discriminating means for making a discrimination of a collision state of said vehicle on the basis of the accelerations detected by said plurality of acceleration sensors; and
threshold switching means for setting said predetermined threshold condition for the vehicle roll judgment in accordance with the collision state discriminated by said collision state discriminating meanswherein said roll judging means sets a threshold line on a two-dimensional map using a roll angular velocity and a roll relative angle as parameters and makes a judgment indicating the occurrence of a roll of said vehicle when a history line drawn on the basis of the roll angular velocity detected by said angular velocity sensor and the roll relative angle calculated by said relative angle calculating means runs from a non-roll area lying on a side of an origin with respect to said threshold line to a roll area lying on a side opposite to said origin with respect to said threshold line, and said threshold switching means sets said threshold line in accordance with the collision state discriminated by said collision state discriminating means.
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Accused Products
Abstract
An activation device for a passenger protection apparatus is made up of a sensor for detecting a roll angular velocity of a vehicle, a unit for calculating a roll relative angle on the basis of the roll angular velocity, and a unit for making a judgment indicating a roll of the vehicle when the velocity and the angle satisfy a threshold condition. A control unit activates an air bag when making a judgment indicating a roll. A vehicle collision state is discriminated on the basis of right-hand and left-hand accelerations detected by acceleration sensors and the threshold condition for the judgment on a roll of the vehicle is switched in accordance with the collision state. This enables a trip-over type roll to be detected at an early stage for activating the passenger protection apparatus quickly.
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Citations
7 Claims
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1. An activation device for a passenger protection apparatus which is made to activate said passenger protection apparatus in accordance with a behavior of a vehicle, comprising:
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an angular velocity sensor for detecting a roll angular velocity of said vehicle; relative angle calculating means for calculating a roll relative angle of said vehicle on the basis of the roll angular velocity detected by said angular velocity sensor; roll judging means for making a judgment indicating the occurrence of a roll of said vehicle when the roll angular velocity detected by said angular velocity sensor and the vehicle roll relative angle calculated by said relative angle calculating means satisfy a predetermined threshold condition; drive control means for activating said passenger protection apparatus when said roll judging means makes the vehicle roll judgment; a plurality of acceleration sensors for detecting accelerations of said vehicle in lateral directions; collision state discriminating means for making a discrimination of a collision state of said vehicle on the basis of the accelerations detected by said plurality of acceleration sensors; and threshold switching means for setting said predetermined threshold condition for the vehicle roll judgment in accordance with the collision state discriminated by said collision state discriminating means wherein said roll judging means sets a threshold line on a two-dimensional map using a roll angular velocity and a roll relative angle as parameters and makes a judgment indicating the occurrence of a roll of said vehicle when a history line drawn on the basis of the roll angular velocity detected by said angular velocity sensor and the roll relative angle calculated by said relative angle calculating means runs from a non-roll area lying on a side of an origin with respect to said threshold line to a roll area lying on a side opposite to said origin with respect to said threshold line, and said threshold switching means sets said threshold line in accordance with the collision state discriminated by said collision state discriminating means. - View Dependent Claims (2, 3, 4)
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5. An activation device for a passenger protection apparatus which is made to activate said passenger protection apparatus in accordance with a behavior of a vehicle, comprising:
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roll detecting means for detecting a rotation of said vehicle in its right-hand and left-hand directions; roll judging means for making a judgment on a roll of said vehicle on the basis of a result of the detection by said roll detecting means; drive control means for activating said passenger protection apparatus when said roll judging means makes a judgment indicating the occurrence of a roll of said vehicle; a plurality of acceleration sensors for detecting accelerations of said vehicle in lateral directions; and trip-over type discriminating means for making a discrimination of a possibility of the occurrence of a trip-over type roll on the basis of a difference between the accelerations detected by said plurality of acceleration sensors, said roll judging means making a judgment indicating the occurrence of a roll of said vehicle at an earlier timing than normal when said discriminated possibility of the occurrence of the trip-over type roll is judged to be high. - View Dependent Claims (6)
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7. An activation device for a passenger protection apparatus which is made to activate said passenger protection apparatus in accordance with a behavior of a vehicle, comprising:
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roll judging means for detecting the behavior of said vehicle to make a judgment indicating the occurrence of a roll of said vehicle when the vehicle behavior detected satisfies a predetermined condition; drive control means for activating said passenger protection apparatus when said roll judging means makes a judgment indicating the occurrence of a roll of said vehicle; a plurality of acceleration sensors for detecting accelerations of said vehicle in lateral directions; and trip-over type discriminating means for making a discrimination of a possibility of the occurrence of a trip-over type roll on the basis of a difference between the accelerations detected by said plurality of acceleration sensors, said roll judging means making a judgment indicating the occurrence of a roll of the vehicle at an earlier timing than normal when the discrimination of the possibility of the occurrence of the trip-over type roll is judged to be high.
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Specification