Denso develops pedestrian collision detection sensor

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Denso Corp has developed a pedestrian collision detection sensor for the Pop-up Hood. The new sensor more precisely detects head-on collisions between vehicles and pedestrians, enabling the Pop-up Hood to operate more accurately.

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“The new sensor technology uses a structure that can more accurately detect head-on collisions, regardless of where the collision takes place on the front bumper,” said Hiroyuki Wakabayashi, executive director responsible for Denso’s Information & Safety Systems Business Group.

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In the conventional Pop-up Hood, several acceleration sensors are installed along the front bumper. However, detection by acceleration sensors varies depending on which part of the front bumper collides with a pedestrian.

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Denso’s new sensor consists of two pressure sensors and a hollow polyethylene housing that is installed across the entire front bumper and conformed to the bumper’s internal shape. In a head-on vehicle/pedestrian collision, these pressure sensors precisely detect the increase in internal pressure of the hollow housing as the bumper deforms, regardless of the collision position on the front bumper.

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This sensor is installed on the Pop-up Hood of the Toyota Crown Hybrid launched in Japan.

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The Pop-up Hood is designed to reduce pedestrian head injuries in a pedestrian/ vehicle engine hood collision by creating a larger buffer space between the hood and hard components, including the engine, under the hood. When a pedestrian collides with the front bumper of a vehicle within a predetermined speed range, the pedestrian collision detection sensor sends the information to the airbag electric control unit to make the hood pop up at the moment of the frontal collision.

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