(19)
(11) EP 1 158 151 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.02.2004 Bulletin 2004/07

(43) Date of publication A2:
28.11.2001 Bulletin 2001/48

(21) Application number: 01112559.8

(22) Date of filing: 23.05.2001
(51) International Patent Classification (IPC)7: F02D 41/02, F02D 41/14, F02D 41/30
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 26.05.2000 JP 2000156556
02.11.2000 JP 2000335964

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi 471-8571 (JP)

(72) Inventors:
  • Idogawa, Masanao, c/oToyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Takagi, Noboru, c/oToyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Hokuto, Hiroyuki, c/oToyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Mizuno, Hiroyuki, c/oToyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Kitamura, Tooru, c/o Toyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)

(74) Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

   


(54) Internal combustion engine control apparatus and method for controlling the same


(57) A forced stoichiometric combustion is executed every time a cumulative travel distance of a vehicle increases by a distance, thereby creating an opportunity to determine an air-fuel ratio value in a region in which a rich spike control is performed. Therefore, the determination of an air-fuel ratio value can be precisely calculated so that the air-fuel ratio value corresponds to a value that reflects a deviation of the actual air-fuel ratio and a proper value. Accordingly, it becomes possible to control, with high precision, correlation between the air-fuel ratio and a proper value based on the determined air-fuel ratio value during a fuel-rich combustion that is caused by the rich spike control.






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