Patent ID: 6332115
Filing Date: 2001-12-18
Classification: B60R,G01P

Abstract:
A hood raising apparatus for raising a hood on a front side of a vehicle, the hood raising apparatus comprising:a collision detecting unit arranged on a front side of the vehicle, for detecting a collision of the vehicle on traveling;a velocity calculating device which inputs a collision signal, which has been generated from the collision detecting unit, as a signal to command an output of calculation results of velocity of the vehicle, the velocity calculating device comprising:an average velocity calculating unit which inputs velocity pulse signals representing rotating speed of wheels of the vehicle to calculate an average velocity of the vehicle at intervals of a first period as a standard;an acceleration calculating unit for calculating an acceleration of the vehicle at intervals of a second period, on the basis of the pulse signals;a momentary velocity calculating unit for calculating a first momentary velocity at intervals of the first period, on the basis of the average velocity and the acceleration calculated;an inputting unit which inputs a signal to command an output of calculation results of velocity of the vehicle;a passing-time measuring unit for measuring a passing time from beginning of the input of velocity pulse signals till the input of the signal to command the output of calculation results; anda momentary velocity estimating unit for estimating a second momentary velocity of the vehicle at a point of time when the signal to command the output of calculation results is inputted, on the basis of the passing time measured by the passing-time measuring unit, the first momentary velocity calculated by the momentary velocity calculating unit and the acceleration calculated by the acceleration calculating unit;a collision judging unit which outputs an ignition signal when the second momentary velocity generated from the velocity calculating unit is within a predetermined velocity range; anda hood raising unit for raising the hood in response to an output of the ignition signal.