Method for determining the fuel/air ratio in the individual...

Details Method for determining the fuel/air ratio in the individual... Method for determining the fuel/air ratio in the individual...

2005-06-28

2005-06-28

Huynh, Hai (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S118040, C060S323000

Reexamination Certificate

active

06910471

ABSTRACT:
A method is presented for determining the fuel/air ratio in the individual cylinders (single cylinder lambda) of an internal combustion engine having a plurality of cylinders, whose exhaust gases mix together in a common exhaust gas pipe system, from the signal of an exhaust gas probe, whose mounting location lies in the common exhaust gas pipe system, with the aid of an invertible model for the intermixing of the exhaust gases at the mounting location of the exhaust gas probe. The method is distinguished in that, in the determination of the single cylinder lambda from the signal of the one exhaust gas probe evaluated with the aid of the inverted model, the rotational angle position of the exhaust gas probe at its mounting position is taken into consideration.

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Moraal et al.,Single Sensor Individual Cylinder Air-Fuel Ratio Control of an Eight Cylinder Engine With Exhaust Gas Mixing, Proc. of the American Control Conf., San Francisco, Jun. 2-4, 1993.
Hasegawa et al.,Individual Cylinder Air-Fuel Ratio Feedback Control Using an Observer, SAE Paper 940376,International Congress & Exposition, Detroit, MI, Feb. 28-Mar. 3, 1994.*

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