Control method of air-fuel ratio in internal combustion engine
专利汇可以提供Control method of air-fuel ratio in internal combustion engine专利检索，专利查询，专利分析的服务。并且PURPOSE:To improve accuracy of air-fuel ratio control, by measuring output voltage of an oxygen sensor, calculating duty ratio, controlling air-fuel ratio with a constant and changing the constant in such a manner that the duty ratio is controlled to within a certain range. CONSTITUTION:Various sensors of an oxygen sensor 32 and the like, and a controller of a fuel injection device 34 and ignition device 36 are connected to a digital computer, comprising a central processing unit (CPU)10, random access memory (RAM)12 and read only memory (ROM)14 and the like. Then maximum and minimum values of duty ratio D and reference voltage V'R, compared with output voltage of the oxygen sensor 32, are set to a prescribed value. The CPU10 measures a time from the maximum value to the minimum value and from the minimum value to the maximum value of the output voltage of the oxygen sensor 32 to calculate the duty ratio D, if smaller than the prescribed minimum value, a value V'R, is used as new reference voltage while if larger than the maixmum value, a value VR, subtracted with 1 from the reference voltage V'R, is used as the new reference voltage, and air-fuel ratio is controlled approximately to theoretical air-fuel ratio.，下面是Control method of air-fuel ratio in internal combustion engine专利的具体信息内容。
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