| 摘要 |
PURPOSE:To enable to detect very accurately by a method wherein a counting pulse, being changed in the frequency thereof in accordance with a differential pressure between a fuel pressure impressed on a fuel injection valve and the vacuum in a suction tube, is generated in an electronic type fuel injection system. CONSTITUTION:First and second pressure sensors 6, 8, detecting the vacuum of the suction tube and the fuel pressure respectively, are provided in the fuel injection system in which the fuel having a pressure regulated in a regulater 5 is injected into the suction tube 2 from the fuel injection valve 3 of which valve opening timing is determined by an injection pulse controlled properly. A difference between the pressures of each sensors 6, 8 is obtained by a differential amplifier and the output thereof is inputted into a V-F converter 10 to generate a pulse signal having a frequency proportional to the signal of the difference. Subsequently, this pulse signal is inputted into a counter 12 through an AND circuit 11, opening and closing in accordance with the injection pulse, to count it. According to this method, a very accurate fuel injecting amount detection, which is not affected by the deviation of an injection pressure, may be facilitated. |
