| 摘要 |
1,181,338. Automatic acceleration control. WESTINGHOUSE ELECTRIC CORP. Oct.7, 1968 [Nov.29, 1967], No.47392/68. Heading G3R. The invention relates to a system for bringing to a halt a vehicle such as a train or lift cage. A pulse counter 12, a tachometer 14 and an accelerometer 22 respectively measure the position, speed and deceleration of the vehicle and provide respective control signals; a computer 10 receives the position and speed signals and generates from them a signal representing the deceleration necessary to halt the vehicle at the required position. This signal is modified by a non-linear circuit 20 and then compared at 18 with the actual deceleration signal to control the drive of the vehicle. The non-linear circuit has the effect of increasing the higher values of deceleration thus tending to halt the vehicle sooner than required; this allows for errors in the measuring devices 14, 22. When the vehicle gets close to the required position a switch 21 is closed by the computer 10 to disconnect the circuit 20. The controller 24 includes means limiting the maximum acceleration to a value commensurate with passenger comfort. The accelerometer 22 may be of pendulum or spring types Fig.6, 7 (not shown) and the circuit 20 may consist of an amplifier with negative feedback applied through a Zener diode (34, Fig.5 not shown). |
