| 摘要 |
PURPOSE:To speedily reduce engine noise by shifting the number of engine revolution to the lower revolution side, allowing the necessary reduction performance to be developed by varying a throttle valve to the closing direction, in little speed-reduction on a car which aims at improvement of fuel consumption. CONSTITUTION:In little reduction in which the brake stepping-in amount signal supplied from a brake position sensor 18 is below a prescribed value, the engine revolution-number signal supplied from an engine revolution-number sensor 20 in brake operation which is sampling-retained by receiving the brake operation signal is corrected by a minus correction value signal. The aimed engine revolution number which is reduction-corrected to the lower revolution side is compared with the actually measured engine revolution number signal supplied from the engine revolution number sensor 20, and a speed change ratio controller 9 is controlled. Thus, the number of engine revolution is set to the aimed engine revolution number of the lower revolution side in comparison with the revolution number in brake operation, and engine noise in little speed-reduction is reduced. |
