Electronic system for calculating mixture strength

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(11)

EP 0 855 498 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.08.1998 Bulletin 1998/35

(43)	Date of publication A2:
	29.07.1998 Bulletin 1998/31

(21)	Application number: 98105228.5

(22)	Date of filing: 09.11.1994

(51)	International Patent Classification (IPC)⁶: F02D 41/14

(84)	Designated Contracting States:
	DE ES FR GB SE

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Priority:

12.11.1993 IT TO930857

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	94117678.6 / 0657637

(71)	Applicant: MAGNETI MARELLI S.p.A.
	20145 Milano (IT)

(72)	Inventors:
	Biagini, Luca 42019 Scandiano (IT) Serra, Gabriele S. Lazzaro Di Savena (IT)

(74)	Representative: Prato, Roberto et al
	STUDIO TORTA S.r.l., Via Viotti 9 10121 Torino 10121 Torino (IT)


	Remarks:
	This application was filed on 23 - 03 - 1998 as a divisional application to the application mentioned under INID code 62.

(54)	Electronic system for calculating mixture strength

(57) System for calculating mixture strength in which an electronic panel (7) is capable of comparing the voltage generated by exhaust gas sensors, in particular from a lambda probe (19) located in the exhaust manifold (21) of a petrol engine (4), with a threshold value (Str) such as to distinguish between a first and a second state (rich state/lean state), corresponding to an air/petrol mixture supplied to the engine which contains more or less petrol, respectively, than is required by the stoichiometric ratio. The system enables this threshold to be updated periodically.

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