| 摘要 |
<p>1394222 Controlling motor vehicles DAIMLER-BENZ AG 8 Nov 1972 [11 Nov 1971] 51544/72 Heading B7H [Also in Divisions G4 and H4] The spacing between a vehicle 2 and a following vehicle 6 is monitored by at least one transmitter 3 which transmits a rearwardly directional beam of light or other radiant energy received by a receiver 7 of the vehicle 6 when it is within a certain distance to produce a warning signal or braking process of the following vehicle. The two transmitters 3, Fig. 2, each emit a beam 4 which for a given speed is at a predetermined angle to the roadway 1, Fig. 1, and a predetermined angle to the vertical plane through the vehicle, the beams overlapping to form a zone 8 of increased intensity. Should the vehicle 2 increase its speed the former angle is increased, such that the point 9 where the receiver strikes the zone 8 is advanced to a point 10. In a modification Figs. 3 and 4 (not shown) the receiver 7 responds to a change in intensity of the directional beam dependent upon the relative speed of the following vehicle to the first vehicle. In another modification, the transmitter(s) emit a directional beam of a frequency or pulse rate dependent upon the vehicle speed; the receiver compares the frequency of a received directional beam with a signal proportional to the speed of the carrying vehicle so that upon establishing a definite comparison a warning signal is given.</p> |
