IGNITION TIMING CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

A water temperature indicated at a startup timing of an engine is stored as a startup-timing water temperature. During an idling state generated after a cold start, a retard amount (S) is calculated based on the startup-timing water temperature. At this time, the retard amount (S) is set at a larger level as the startup-timing water temperature becomes higher. However, in a case that the startup-timing water temperature is higher than a predetermined temperature, the retard amount (S) is set at a smaller level as the startup-timing water temperature becomes higher. A retard amount (R) is calculated based on a current water temperature in the same manner as the retard amount (S). A smaller one is selected from the retard amount (S) and the retard amount (R), as a basic retard amount.

主权项

1. An ignition timing control device of an internal combustion engine, comprising:
an ignition device configured to ignite air-fuel mixture of a combustion chamber of the internal combustion engine; a catalyst interposed in an exhaust passage of the internal combustion engine and configured to purify an exhaust gas flowing in the exhaust passage; a water temperature detecting section configured to detect a water temperature of a cooling water of the internal combustion engine; an ignition-timing retarding section configured to correct an ignition timing of the ignition device to a retard side such that an activation of the catalyst is promoted, during an idling operation generated after a cold start of the internal combustion engine; and a startup-timing-water-temperature retard-amount calculating section configured to calculate a retard amount by which the ignition-timing retarding section retards the ignition timing, based on a startup-timing water temperature which is the water temperature indicated at a startup timing of the internal combustion engine, wherein the startup-timing-water-temperature retard-amount calculating section is configured
to set the retard amount at a larger level as the startup-timing water temperature becomes higher, in a case that the startup-timing water temperature is lower than or equal to a predetermined temperature which is lower than at least an activating temperature of the catalyst, andto set the retard amount at a smaller level as the startup-timing water temperature becomes higher, in a case that the startup-timing water temperature is higher than the predetermined temperature.