Method for controlling idling in an internal combustion engine

(19)

(11)

EP 1 072 778 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	28.08.2002 Bulletin 2002/35

(43)	Date of publication A2:
	31.01.2001 Bulletin 2001/05

(21)	Application number: 00830518.7

(22)	Date of filing: 20.07.2000

(51)	International Patent Classification (IPC)⁷: F02D 41/14, F02D 41/16

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

28.07.1999 IT TO990663

(71)	Applicant: C.R.F. Società Consortile per Azioni
	10043 Orbassano (Torino) (IT)

(72)	Inventor:
	Ponti, Cesare 10043 Torino (IT)

(74)	Representative: Marchitelli, Mauro et al
	c/o Buzzi, Notaro & Antonielli d'Oulx Via Maria Vittoria 18 10123 Torino 10123 Torino (IT)

(54)	Method for controlling idling in an internal combustion engine

(57) Method for controlling idling in an internal combustion engine for vehicles, comprising the phases of:

supervising at least one operating parameter of the engine, and
correcting the quantity of air/fuel delivered to the engine as a function of the variations of the said operating parameter, in order to maintain the revolution speed of the engine essentially equivalent to a pre-established value of reference. The objective of the method is to establish an estimated value of a torque applied to the engine as a function of an angular acceleration value detected during a cycle of the internal combustion engine and to effect a correction of the quantity of air/fuel delivered to the engine as a function of the variations in the said estimated torque value.