| 摘要 |
1488181 Automatic speed control K H SCHMALL 24 Jan 1975 [25 Jan 1974 23 Feb 1974] 3158/75 Heading G3R [Also in Division B7] The speed control device of a motor vehicle engine can be adjusted alternatively by the driver or by an automatic control arrangement in dependence on a switch operable by the driver. The automatic arrangement includes a comparator receiving actual and desired vehicle speed signals. As shown in Fig. 1, an electric motor 14 is energized in accordance with the difference between a voltage set by a potentiometer 18 and a voltage derived by a converter 16 from pulses produced by a motor vehicle contact breaker, tachogenerator or optical speed sensing device. To obtain automatic speed regulation, the vehicle driver places his foot on a plate 4, thereby operating a lever 12 which presses a roller 11 against a shift rod 10. The rod is then driven longitudinally by a wheel 13 on the output shaft of the motor 14. The rod 10 acts through an additional pedal 8 to move the vehicle accelerator pedal 9 and thus regulate the vehicle speed in accordance with the setting of potentiometer 18. To return to driver control, the foot is lifted from the plate 4, thereby removing the pressure from the rod 10 and wheel 13, and the pedal 8 is controlled in the normal manner. In an alternative arrangement, Fig. 3 (not shown), the plate 4 actuates an electrical contact, causing relays to couple the shaft of motor 14 to a rack and pinion device connected between the accelerator pedal and the vehicle carburetter. The set voltage on potentiometer 18 may be automatically reduced when the vehicle is travelling around a bend by connecting a potentiometer between the vehicle steering and the regulator, Fig. 4 (not shown). In other embodiments, Figs. 5 and 6 (not shown), arrangements are provided whereby the reference voltage produced by potentiometer 18 is maintained equal to the voltage from the actual speed converter 16 when the vehicle is under driver control, so that a smooth transition to automatic control is ensured when the driver actuates the plate 4 at any desired vehicle speed. |
