(19)
(11) EP 2 037 104 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
01.07.2009 Bulletin 2009/27

(43) Date of publication:
18.03.2009 Bulletin 2009/12

(21) Application number: 07425566.2

(22) Date of filing: 13.09.2007
(51) International Patent Classification (IPC): 
F02D 41/00(2006.01)
F02D 41/14(2006.01)
 F02D 41/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(71) Applicant: MAGNETI MARELLI POWERTRAIN S.p.A.
20011 Corbetta (IT)

(72) Inventors:
  • Caterini, Canio Rocco
    85010 Cancellara (IT)
  • Zanotti, Massimo
    40040 Vado (IT)
  • Sala de Llobet, Carlo Enrico
    40134 Bologna (IT)
  • Zecca, Luca
    40010 Sala Bolognese (IT)
  • Lambertini, Loris
    40056 Crespellano (IT)

(74) Representative: Jorio, Paolo et al
STUDIO TORTA Via Viotti 9
10121 Torino
10121 Torino (IT)

   


(54) Fuel volatility recognition method during the postcranking step of an internal combustion engine


(57) A fuel volatility recognition method during the post-cranking step of an internal combustion engine (1); the recognition method contemplates the steps of: starting the internal combustion engine (1); adjusting the enrichment of the mixture burnt in the cylinders (2) of the internal combustion engine (1) according to a previously determined historic fuel volatility value; detecting the time evolution of the angular speed (ω) of a crankshaft (4) of the internal combustion engine (1) during the post-cranking step; determining the noise (r) contained in the angular speed (ω) of the crankshaft (4) by filtering the angular speed (ω) itself by means of a high-pass filter; comparing the noise (r) contained in the angular speed (ω) of the crankshaft (4) against at least one predetermined threshold value (Tv); and recognizing the fuel volatility according to the result of the comparison between the noise (r) contained in the angular speed (ω) of the crankshaft (4) and the predetermined recognition threshold (Tv).