Global Patent Index - EP 2392805 A1

EP 2392805 A1 20111207 - Fuel injection control system

Title (en)

Fuel injection control system

Title (de)

Brennstoffeinspritzungssteuersystem

Title (fr)

Système de contrôle d'injection de carburant

Publication

EP 2392805 A1 20111207 (EN)

Application

EP 11166845 A 20110520

Priority

  • JP 2010128814 A 20100604
  • JP 2010128813 A 20100604

Abstract (en)

To provide a fuel injection control system which properly sets a limit value of an air-fuel ratio feedback correction value, thereby making a good air-fuel ratio feedback control possible. While a variation rate of an output value of an oxygen sensor (32) is changed from the positive to the negative or from the negative to the positive predetermined times after a power source of a vehicle is turned on, a control unit (C) sets a first limit range (L1) for an air-fuel ratio feedback correction factor (K02) as an upper/lower limit value which have a predetermined upper/lower width, in which the output value of the oxygen sensor (32) detected in a stoicshiometric air-fuel ratio state is a reference value (B1), and which is allowed to be used for calculating a correction injection quantity (T1). After a variation rate of the output value of the oxygen sensor (32) is changed from the positive to the negative or from the negative to the positive predetermined times, the air-fuel ratio feedback correction factor (K02) that is calculated when the variation rate is changed the predetermined times is regarded as a reference value (B2), and a second limit range (L2) which has a predetermined upper/lower width from the reference value (B2) and is narrower than the first limit range (L1) is set.

IPC 8 full level

F02D 41/14 (2006.01); F02D 41/06 (2006.01); F02D 41/22 (2006.01)

CPC (source: EP)

F02D 41/065 (2013.01); F02D 41/1438 (2013.01); F02D 41/22 (2013.01)

Citation (applicant)

None

Citation (search report)

Designated contracting state (EPC)

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 RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2392805 A1 20111207; EP 2392805 B1 20130731; CN 102269068 A 20111207; CN 102269068 B 20141029

DOCDB simple family (application)

EP 11166845 A 20110520; CN 201110147413 A 20110602