| 摘要 |
PURPOSE:To detect an abnormal frequency and prevent an accident such as an incomplete combustion or the like by a method wherein in a circuit for a combustion control device, a duty variable pulse is inputted in it and compared with an expected frequency range which is acknowledged as a normal condition and if it is out of the range, an abnormal signal is outputted. CONSTITUTION:When a fuel supplying volume signal circuit So corresponding to each of the burning capacity is applied from a main control circuit 4 to a sproportional valve during circuit 5, a duty variable pulse Sp which is made as a duty pulse corresponding to the fuel supplying volume is produced at the output of the proportional valve during circuit 5. This duty variable pulse Sp is inputted to the proportional valve 6 to control the same, an effective opening area of the fuel supplying passage is controlled in such a way as it may correspond to the duty value at the time and thus the fuel supplying volume is controlled. This duty variable pulse Sp is inputted to the frequency abnormal condition sensing circuit 8 to generate the signal. |
