| 摘要 |
PURPOSE:To evaluate the degree of risk on collision with a constant threshold value even when the angle of the base line of collision against the normal line is large (oblique collision) by calculating the constituent of the relative speed perpendicular to the base line from the detected output of a sensor. CONSTITUTION:Distance/speed sensors 1, 2 having light projection sections and light reception sections are provided on a moving body 3 at an interval of the base line length, and light beams 4, 5 are emitted from the sensors 1, 2 to cross each other. An obstacle 6 approaches the moving body 3 at the speed vector V, and it gets into contact with the light beam 4 at a point P when it is moved to the position 7. The scattered light is received by the sensors 1, 2 at the point P, and distances of the point P from both ends of a base line AB and constituents V1, V2 of the speed vector V in the directions of the sensors 1, 2 are measured. When the relative speed constituent VY=Vcostheta2 perpendicular to the base line AB exceeds the preset value Vth, a life protecting device such as an air bag or a pre-tension must be activated. The speed constituent VY (degree of risk) is obtained from measured parameters. |
