| 摘要 |
<p>PURPOSE:To make it possible to uniformly maintain the convergency of vehicle speed to a desired vehicle speed, irrespective of variations in running load by changing a control gain in feed-back control so as to adjust the vehicle speed to the desired speed, in accordance with a selected running load. CONSTITUTION:Feed-back control in constant speed running control calculates a manipulating amount of a throttle valve so as to make an actual vehicle speed Vn equal to a desired vehicle speed Vo with the use of P+I and P+D control systems. In this arrangement, an ideal running road is calculated in accordance with a difference in throttle valve opening degree between the present running mode and a steady state running mode on a flat land. Accordingly, the proportional constant and integrating constant of the P+I control system are increased, while the proportional constant and differentiating constant of the P+D control system are decreased. Thus, it is possible to make the convergency to a desired vehicle speed constant, irrespective of differences in running load, thereby it is possible to carry out satisfactory control for constant speed running.</p> |
