Collision detection device for vehicle
First Claim
1. A collision detection device for a vehicle, comprising:
- an air chamber space arranged in the vehicle and configured so that a pressure in the air chamber space changes in accordance with a collision with the vehicle;
a pressure sensor configured to detect a pressure change in the air chamber space; and
a collision determination portion configured to determine the collision with the vehicle based on an output value of the pressure sensor, whereinthe collision determination portion calculates an integration value by integrating the output value of the pressure sensor by a time, and calculates a pressure change amount based on the output value of the pressure sensor,the collision determination portion determines the collision with the vehicle by comparing the pressure change amount with a threshold value set with respect to the integration value, in a relation of the pressure change amount with respect to the integration value.
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Accused Products
Abstract
A collision detection device for a vehicle includes an air chamber space, a pressure sensor and a collision determination portion. The air chamber space is arranged in the vehicle, and a pressure therein is changed in accordance with a collision with the vehicle. The pressure sensor detects a pressure change in the air chamber space. The collision determination portion determines the collision with the vehicle. An output value of the pressure sensor is integrated by time to calculate an integration value, and the collision with the vehicle is determined based on a threshold value set with respect to the integration value, and the output value of the pressure sensor. Therefore, when the collision with the vehicle occurs, whether an occupant protection device should be activated can be determined promptly.
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Citations
5 Claims
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1. A collision detection device for a vehicle, comprising:
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an air chamber space arranged in the vehicle and configured so that a pressure in the air chamber space changes in accordance with a collision with the vehicle; a pressure sensor configured to detect a pressure change in the air chamber space; and a collision determination portion configured to determine the collision with the vehicle based on an output value of the pressure sensor, wherein the collision determination portion calculates an integration value by integrating the output value of the pressure sensor by a time, and calculates a pressure change amount based on the output value of the pressure sensor, the collision determination portion determines the collision with the vehicle by comparing the pressure change amount with a threshold value set with respect to the integration value, in a relation of the pressure change amount with respect to the integration value. - View Dependent Claims (2, 3, 4, 5)
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Specification