| 摘要 |
1,241,616. Antiskid braking systems. BENDIX CORP. 18 Nov., 1969 [16 Dec., 1968], No. 56406/69. Heading F2F. In a brake antiskid system including a control channel for controlling the brake force simultaneously on a first and second vehicle wheel in response to a selected control signal and including means for generating signals proportional to the rotational velocities of the first and second wheels respectively, the control signal selection device comprises circuitry, responsive to the signals, for sorting the signals and causing a low voltage signal to be produced on one terminal and a high voltage signal on another terminal, a comparator responsive to the signals for generating a primary error signal whenever the ratio of the signals exceeds a predetermined value and means responsive to the error signal for sampling the terminals, the sample comprising the selected control signal. Wheel sensors 6, 10 generate pulses at a level related to wheel velocity and the pulses are converted to a D.C. voltage level, proportional to wheel speed, in counters 8, 12 to provide on terminals 8a, 12a D.C. voltage levels proportional to the rotational velocity of the left and right wheels respectively, these signals being sorted by circuits 14, 16 so that the low speed signal always appears on terminal 18 and the high speed signal on terminal 20. A comparator 24 such as a differential amplifier has applied thereto the left wheel voltage signal directly and the right wheel voltage signal attenuated by resistors 26, 28, another comparator 34 having applied directly thereto the voltage on terminal 12a and the attenuated voltage from terminal 8a and the outputs are fed through respective diodes 36, 38 to a power stage 40 which can energize a relay coil 22b and cause relay pole 22a to contact terminal 20 instead of terminal 18. When the wheel speeds are similar within predetermined limits, power stage 40 has no output and control channel 42 is connected to the low velocity terminal 18 but when they differ by a predetermined amount the channel 42 receives the high speed voltage signal. |
