초록 ▼

An engine speed control method and apparatus employs at least two basic control variable maps comprising a first basic control variable map for determining the desired air flow to an internal combustion engine in accordance with the warming conditions of the engine during the starting period and a s

An engine speed control method and apparatus employs at least two basic control variable maps comprising a first basic control variable map for determining the desired air flow to an internal combustion engine in accordance with the warming conditions of the engine during the starting period and a second basic control variable map for determining the desired air flow in accordance with the warming conditions of the engine after the starting period, and the maps are used selectively in accordance with the warming conditions of the engine. Upon change-over from the control according to one map to the control according to the other map, the air flow is varied gradually at intervals of predetermined engine revolutions or a predetermined period of time so as to effect the change-over to the control according to the desired map. During the idling operation after the engine has been warmed up sufficiently, the difference between each of the desired idling speeds preliminarily established in correspondence to the operating conditions of the engine and the actual idling speed is detected and the required correction values of the basic control variable for controlling the air flow are computed and stored thereby controlling the idling speed of the engine.

대표청구항 ▼

In a method of controlling an idling speed of an internal combustion engine in accordance with a basic control variable preliminary established for controlling an idle air flow so as to maintain the idling speed at a rate corresponding to a warming condition of the engine, the improvement including:

In a method of controlling an idling speed of an internal combustion engine in accordance with a basic control variable preliminary established for controlling an idle air flow so as to maintain the idling speed at a rate corresponding to a warming condition of the engine, the improvement including: selectively using at least two different supply sources for supplying said basic control variable in accordance with engine conditions and load conditions of said engine, wherein said supply sources include at least a first basic control variable supply source for engine starting purposes and a second basic control variable supply source for warming up purposes, and wherein upon change-over between said sources, said control variable obtained in accordance with said first source is decreased by a predetermined value every predetermined interval such that when said control variable becomes smaller than one obtained in accordance with said second source, said control variable is varied in accordance with said second source.