| 摘要 |
PURPOSE:To facilitate proper air-fuel ratio control in correspondence with operation state by correcting the feedback correction value set and successively rewriting the value to be stored into a data table, when the average value of the feedback correction value per time is outside a prescribed control range, and keeping said feedback correction value always at a nearly fixed value. CONSTITUTION:When a fuel standard feed amount FB, feedback correction value Ca, average value Cb of the feedback correction value, the correction value set Cc, and the correction value alpha according to engine temperature, composition of exhaust, etc. are determined, a proper fuel demand amount F is represented by the function of Ca, Cc, alpha, and FB. The operation range is divided into ranges A1-An according to the engine revolution speed and th negative pressure in an intake pipe, and the correction value Cc for each range is stored into a data table. The feedback correction value Ca per time is integration-calculated, and when the average value is outside a prescribed control range, the correction value Cc set in the data table is corrected to a newly set correction value, and the feedback correction value Ca is set nearly 1, and sharp and proper feedback control is permitted. |
