| 摘要 |
<p>A pulse generator supplies to a logic unit, pulses whose number is determined by a quantity of movement of an elevator car. The logic unit effects the algorithm and comparison of the quantity of movement of the car and a command quantity of movement of the car to produce a speed signal which, in turn, controls the car. The pulses are also stored in a memory and an electric source energizes the memory and the pulse generator for a predetermined time after the occurrence of an emergency.</p> |
