METHOD FOR CONTROL OF IDLE ROTATIONS OF INTERNAL COMBUSTION ENGINES

摘要

The idling rotational speed of an internal combustion engine is controlled proportionately to the value of a control valve command (Icmd) obtained on the basis of the sum of a feedback control term (Ifb) and an additional correction term conforming to the external load of said internal combustion engine, thereby obtaining said additional correction term as a function of a parameter depending upon the deviation of intake manifold pressures (Pba) between no-loaded and loaded conditions of said external load. A learnt value(Pbref) is calculated based on an intake manifold(33) pressure when said internal combustion engine is in idling condition, the control valve(30) is under feedback control, and said internal combustion engine is in a no-load state. When said internal combustion engine is in a loaded state, an existing manifold pressure is detected and the addition correction term(Iat) is calculated based on an difference between the learnt value and the detected manifold pressure.