| 摘要 |
PURPOSE: A fuel feedback control method is provided for preventing an engine rpm change caused by an engine discordance by fuel feedback control considering a frequency characteristics of an oxygen sensor. CONSTITUTION: In a fuel injection control method of a vehicle, a thinness of a mixed gas is decided by comparing a signal of an oxygen sensor(20) with a reference value. In the case that the signal of the oxygen sensor(20) is smaller than the reference value for the mixed gas is rich, a fuel injection is reduced by reducing the injection time according to a frequency characteristics of the oxygen sensor(20). In the case that the signal of the oxygen sensor(20) is larger than the reference value for the mixed gas is lean, the fuel injection is increased by increasing the injection time according to the frequency characteristics of the oxygen sensor(20). By repeating above operation, the supplied mixed gas is controlled within an approximate range to a theoretical air-fuel ratio.
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