| 摘要 |
1,204,186. Automatic traction control. MASCHINENFABRIK OERLIKON. Oct.9, 1967 Nov. 24, 1966, No. 46060/67. Heading G3R. Also in Division H2 In a traction system, excessive wheel-slip is prevented by reducing the tractive effort in response to a signal having variable and constant components which are developed from an axledriven tachometer generator 1. The output of the generator is rectified, smoothed, and differentiated to provide a deceleration signal ar which is applied to flip-flop circuits 8, 9, associated with an OR- gate 10. When the decleration signal is between a minimum and mean value, the polarity of terminal S', of circuit 8 is such that diode 13 conducts, this Diode 20 conducts when the deceleration of the wheel reaches a maximum value so that capacitor 15 discharges through resistor 21, the output voltage of the amplifier 16 decreasing. The rate of discharge is changed when diode 24 conducts, and diode being connected to Zener diode 11 and resist- or 12. Capacitor 15 is charged through resistor 14 so that amplifier 16 generates an increasing correction-signal component delta JS1. When the signal ar exceeds the mean value, the terminal S' changes polarity, diode 13 is blocked, and the output of amplifier 16 remains constant for a period. the capacitor 15 discharges through high ohmic resistor 25 so that the output voltage of the amplifier 16 falls slowly and linearly with time. At the commencement of wheel-spin, capacitor 30 is charged rapidly through diode 28 so that diode 29 conducts to provide correction-signal component delta JS2. This component is held constant for an extended period until the polarity of terminal S of the gate 10 changes sign and the capacitor 30 is discharged through resistor 26. The traction motor 38 is supplied through rectifier bridge 36, a reference signal JC for the motor current being derived from potentiometer 31 through a non-linear limiting element 32. The anti-wheel spin device 33 provides signal JCS representing the sum of signals delta JS1 and delta JS2. The resultant signal JCr is compared with current signal J to control the rectifier 36. The anti-slip device may be modified to control regenerative braking of the vehicle. |
