Blockierschutz-Bremssystem fuer Fahrzeuge

1,197,246. Transistor pulse circuits. BENDIX CORP. 19 Sept., 1968 [9 Oct., 1967], No. 44537/68. Heading H3T. [Also in Divisions F2 and G3] In an antiskid braking system, a sensor 32 generates an alternating signal of frequency dependent on wheel speed which signal is rectified and the resulting pulse charge capacitors 120, 128 to voltages dependent on the wheel speed. Temperature compensating diodes 123, 124 are provided to correct the voltage on capacitor 120. The resulting D.C. signal is differentiated and amplified and fed to a differential amplifier 160, 170 also fed with a reference signal set on a potentiometer 171. If the resulting signal at the collector of transistor 160 is less than a predetermined value, a monostable multivibrator 220, 230 is triggered to deliver a pulse through amplifier 90. The trailing edge of this pulse turns off a transistor 210 to start a Miller integrator 200, 201, 202 and when the voltage on the base of transistor 190 rises above that on the base of transistor 180, the multivibrator is again triggered, so that the pulse repitition rate varies with the voltage applied to the base of transistor 180. If this voltage is sufficiently low, it is always less than that on the base of transistor 190 so that a continuous D.C. signal is transmitted through amplifier 90.