| 摘要 |
<p>1463343 Automatic control of speed BENDIX CORP 9 July 1974 [30 July 1973] 30411/74 Heading G3R An automatic speed control system for a vehicle, using a desired vehicle speed and measured, speed dependent variables, is modified according to the difference between the measured variables and a predicted performance as calculated by a mathematical model from the desired speed. As shown the speed, acceleration and position relative to a preceding vehicle (i.e. range) are controlled by multipliers 26, 28, 24 respectively. A predicted speed from model 18 is calculated from the desired speed, and modified in multiplier 38 by the difference between the actual speed and the predicted value. Multiplier 26 receives the output of multiplier 38, and a signal dependent upon the vehicle speed error, to form one input to summer 31. This also receives the output of multipliers 28, 24 that are modified by multipliers 40, 36 according to the actual and predicted acceleration and position errors respectively. The output of summer 31 is used to vary the vehicle acceleration of braking as necessary to maintain the desired speed. This desired value is set by the driver (at 14), or according to external means e.g. in dependence upon weather conditions or traffic volume, and may be modified by the range as measured using radar. The control can be modified if the range falls below a "safe" distance (as set by vehicle speed) or if the rate of change of range exceeds a limit, in which case the modification is dependent upon the time that the limit is exceeded. The system is also described with reference to Figs. 3 and 4 (not shown).</p> |
