| 摘要 |
PURPOSE:To eliminate delay in the informing timing, and inform the fact in the proper timing by judging an acceleration condition where travel speed reaches informing speed and approach to the informing speed, and outputting an informing signal almost simultaneously when the travel speed reaches the informing speed. CONSTITUTION:Automobile travel speed detected by a vehicle speed sensor 1 is outputted as pulse signals having a frequency in proportion to these, and is inputted to an operation part 2 after waveform shaping. The operation part 2 counts the inputted pulse signals in a prescribed gate period, or measures an inputted pulse signal period by a reference clock signal, and calculates travel speed periodically, and outputs acceleration to a control part 3 by carrying out operation. The control part 3 finds out how many seconds later preset information speed is attained if an increase in present acceleration is continued at present speed according to travel speed data and acceleration data from the operation part 2, and judges to inform the fact when this is the preset time, and outputs an informing signal to a voice synthesizing part 5. |
