Fuel metering control system for internal combustion engine

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EP 0 719 928 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	10.03.1999 Bulletin 1999/10

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

(21)	Application number: 96300015.3

(22)	Date of filing: 02.01.1996

(51)	International Patent Classification (IPC)⁶: F02D 41/14, F02D 41/34

(84)	Designated Contracting States:
	DE FR GB

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Priority:

30.12.1994 JP 340021/94
25.02.1995 JP 61653/95
25.02.1995 JP 61655/95

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

(72)	Inventors:
	Maki, Hidetaka, c/o K.K. Honda Wako-shi, Saitama (JP) Akazaki, Shusuke, c/o K.K. Honda Wako-shi, Saitama (JP) Hasegawa, Yusuke, c/o K.K. Honda Wako-shi, Saitama (JP) Komoriya, Isao, c/o K.K. Honda Wako-shi, Saitama (JP) Nishimura, Yoichi, c/o K.K. Honda 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 including a feedback loop having an adaptive controller and an adaptation mechanism that estimates a controller parameters θ̂. The adaptive controller corrects the quantity of fuel injection to bring a controlled variable obtained at least based on an output of said air/fuel ratio sensor, to a desired value. The air/fuel ratio sensor outputs are sampled and one of the sampled data is selected as the air/fuel ratio to be input to the adaptation mechanism. Similarly, the sensor outputs are sampled and one of the samples is selected in accordance with another characteristic to be used in the estimation of the air/fuel ratios of the individual cylinder. The air/fuel ratio is discriminated to be within a prescribed range, and set to a predetermined value when it is determined to be within the prescribed range.

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