| 摘要 |
PURPOSE:To promote the stabilization of an ignition timing control by disabling the control to be reset to the total correction for an engine in its cooling water temperature of not more or less than the predetermined value in case of resetting to the total correction by a partial correction value, in a study control system of ignition timing. CONSTITUTION:Determining the basic map MB from an advance timing upper limit map MH and a delay timing lower limit map ML of ignition timing, the optimum ignition timing map MT is created by adding each partial correction value. While setting a decision quantity L in accordance with cooling water temperature, a reference value R, based on this decision quantity L, is input to a reset decision part 22. In a predetermined water temperature, because the reference value R is placed in a low level, when each partial correction value changes due to a change of gasoline quality or the like, a control is decided exceeding the reference value R being reset to the total correction. When cooling water is in low or high temperature, because the decision quantity L and the reference value R are set to a high level, even when each partial correction value changes following a change of the knocking limit, the control is difficult to be reset to the total correction. Accordingly, limiting a restudy for a temporary condition of low or high temperature of water, the ignition timing control is stabilized. |
