(19)
(11) EP 2 075 662 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:
30.09.2009 Bulletin 2009/40

(43) Date of publication:
01.07.2009 Bulletin 2009/27

(21) Application number: 08022300.1

(22) Date of filing: 22.12.2008
(51) International Patent Classification (IPC): 
G05B 21/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 25.12.2007 JP 2007332969

(71) Applicant: Honda Motor Co., Ltd.
Minato-ku Tokyo 107-8556 (JP)

(72) Inventors:
  • Yasui, Yuji
    Wako-shi Saitama 351-0193 (JP)
  • Kawasumi, Ikue
    Wako-shi, Saitama, 351-0193 (JP)

(74) Representative: Prechtel, Jörg et al
Weickmann & Weickmann Patentanwälte Postfach 86 08 20
81635 München
81635 München (DE)

   


(54) Control apparatus and method


(57) A control apparatus which can improve the accuracy of control of a controlled variable by a control input exhibiting a periodic fluctuating behavior. The control apparatus calculates an air-fuel ratio correction value DKCMD such that the output from an oxygen concentration sensor converges to a target output, and calculate a modulated value DKCMD_DSM by modulating DKCMD with an algorithm to which is applied a ΔΣ modulation algorithm. Further, the control apparatus calculates a reference air-fuel ratio KCMDBS according to an exhaust gas volume, calculates a model modification coefficient KTRQFF using a modification coefficient calculated such that DKCMD become equal to 0, calculates an adaptive reference air-fuel ratio KCMDADP by the equation of KCMDADP = KCMDBS x KTRQFF, and calculates a target air-fuel ratio KCMD by the equation of KCMD = KCMADP + DKCMD_DSM.