(19)
(11) EP 0 719 923 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.02.1999 Bulletin 1999/05

(43) Date of publication A2:
03.07.1996 Bulletin 1996/27

(21) Application number: 96300007.0

(22) Date of filing: 02.01.1996
(51) International Patent Classification (IPC)6: F02D 41/14, F02D 41/04
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.12.1994 JP 340033/94

(71) Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
Minato-ku Tokyo (JP)

(72) Inventors:
  • Maki, Hidetaka
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)
  • Akazaki, Shusuke
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)
  • Hasegawa, Yusuke
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)
  • Komoriya, Isao
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)
  • Nishimura, Yoichi
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)
  • Hirota, Toshiaki
    4-1, 1-chome, Chuo, Wako-shi, Saitama (JP)

(74) Representative: Tomlinson, Kerry John 
Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)

   


(54) Fuel metering control system for internal combustion engine


(57) A fuel metering control system for an internal combustion engine having a plurality of cylinders. The system includes an air/fuel ratio sensor and engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load. The basic quantity of fuel injection is determined by retrieving mapped data according to the engine speed and engine load. An adaptive controller is provided to calculate a first feedback correction coefficient such that the detected air/fuel ratio is brought to a desired air/fuel ratio. The desired air/fuel ratio is corrected by a second air/fuel ratio sensor installed downstream of a catalytic converter. A PID controller is added to calculate a second feedback correction coefficient to correct the quantity of basic fuel injection such that variance between the individual cylinder air/fuel ratios is decreased. The quantity of fuel injection is further corrected by fuel adhered on an intake manifold wall.






Search report