| 摘要 |
1443514 Aritiskid or aritispin control systems GIRLING Ltd 9 July 1973 [18 July 1972 (2)] 33514/72 and 33515/72 Heading F2F A system for controlling slip or spin of a wheel of a vehicle such as a rail vehicle comprises means operable to produce an electrical signal representing the rotational speed of a wheel, a differentiating circuit producing an output dependent on the rate of change of said signal, control means sensitive to the output to control the application of torque to the wheel, said control means acting to reduce the torque applied when the rate of change of said signal exceeds a predetermined level, and means for clamping the input of the differentiating circuit when the wheel speed is below a predetermined value so as to render the control means inoperative to reduce the torque applied to such condition. A wheel-driven alternator 11 has its output rectified and applied to the differentiating circuit 24 which is clamped by a resistance chain connected across the alternator output, a diode 29 being non-conductive until the wheel speed is below the predetermined value. A nickel-cadmium battery 38 is charged by the alternator and is disconnected from the system, when the latter is inoperative, by means of a relay having a winding 37 and contact 37a. When deceleration reaches a predetermined level denoting imminent wheel slip control means 25 energizes a winding 26 to release the brakes and when the wheel ceases to rotate alternator 12 no longer produces an output so that contact 37a opens to prevent discharge of battery 38. To control wheel spin the control circuit 25 operates means for removing power drive from the wheel. |
