| 摘要 |
PURPOSE:To operate an internal-combustion engine smoothly even when the opening of a throttle valve is large, by detecting the maximum value and the minimum value of the frequency of the signals produced by a Karman-vortex flow meter while the engine is rotated by a certain angle, and determining the injection quantity of fuel from a logical frequency. CONSTITUTION:A Karman-vortex flow meter 100 produces a signal having a frequency corresponding to the quantity of intake air drawn to an internal-combustion engine. A means 101 detects the maximum value and the minimum value of the frequency of the signals produced by the flow meter 100 while the engine is rotated a predetermined angle. An arithmetic means 102 calculates the difference of the maximum and minimum values detected by the means 101, while a judging means 103 judges whether the difference detected by the arithmetic means 102 is greater than a predetermined value or not. A mean-value calculating means 104 calculates the mean value of the maximum value and the minimum value obtained by the detecting means 101. In case that judgement is made by the means 103 that the above-mentioned difference is greater than said predetermined value, a means 107 calculates the injection quantity of fuel on the basis of a logical frequency stored in a memory 105. In case that said difference is smaller than the predetermined value, an injection means 108 injects fuel on the basis of the mean value obtained by the calculating means 104. |
