(19)
(11) EP 2 284 380 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.08.2013 Bulletin 2013/35

(43) Date of publication A2:
16.02.2011 Bulletin 2011/07

(21) Application number: 10172447.4

(22) Date of filing: 11.08.2010
(51) International Patent Classification (IPC): 
F02D 41/38(2006.01)
F02M 63/02(2006.01)
 F02M 55/02(2006.01)
F02D 41/14(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 12.08.2009 IT BO20090545

(71) Applicant: Magneti Marelli S.p.A.
Corbetta (MI) (IT)

(72) Inventors:
  • Serra, Gabriele
    40068 S. Lazzaro di Savena (IT)
  • De Cesare, Matteo
    71017 Torremaggiore (IT)
  • Parotto, Marco
    40138 Bologna (IT)

(74) Representative: Bergadano, Mirko et al
Studio Torta S.p.A. Via Viotti, 9
10121 Torino
10121 Torino (IT)

   


(54) Method for controlling the common rail pressure of a direct injection engine


(57) A method for controlling a direct injection system (1) of common-rail type of an internal combustion engine (2); the direct injection system (1) has: a fuel tank (10), a low pressure pump (8) which draws from the tank (10), and a high pressure pump (6) which receives the fuel from the low pressure pump (8) and feeds the pressurized fuel to a common rail (5) connected to a number of injectors (4); the control method includes the steps of: determining a desired pressure (Prailref) of the fuel inside the common rail (5); and regulating the delivery of the low pressure pump (8) towards the high pressure pump (6) to pursue the desired pressure
(Prailref) of the fuel inside the common rail (5) and so as to obtain a corresponding regulation of the delivery of the high pressure pump (6) towards the common rail (5). The method involves determining closed loop contribution, open loop contribution (feedforward) and the use of nested control loops.







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