Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1983-05-27
1985-03-05
Lall, Parshotam S.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, 123479, F02M 700
Patent
active
045024430
ABSTRACT:
An air/fuel ratio control method in which the air fuel ratio of an air/fuel mixture being supplied to an internal combustion engine, is controlled to required values in synchronism with generation of a predetermined control signal, by the use of a first coefficient which has a value variable with a change in the output of the oxygen concentration detecting means, during feedback mode control, and by the use of a second coefficient which is a mean value of values of the first coefficient applied during the above feedback mode control, during operation of the engine in a mode other than the feedback mode control. When an abnormality occurs in the functioning of the oxygen concentration detecting means, the second coefficient alone is always used for the air/fuel ratio control. Preferably, it is determined that an abnormality occurs in the oxygen concentration detecting means, either if a difference between a value of the first coefficient obtained at generation of a present pulse of the above control signal and a value of the same coefficient obtained at generation of a preceding pulse of the same control signal does not change from a negative value to a positive value or vice versa for a predetermined period of time, or if the output value of the oxygen concentration detecting means does not change across a predetermined reference value at all for a second predetermined period of time after the engine temperature has exceeded a predetermined value at or after the start of the engine.
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patent: 3938479 (1976-02-01), Oberstadt
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patent: 4252098 (1981-02-01), Tomczak et al.
patent: 4359029 (1982-11-01), Furuhashi et al.
patent: 4392471 (1983-07-01), Miyagi et al.
patent: 4399792 (1983-08-01), Otsuka et al.
patent: 4414950 (1983-11-01), Otsuka et al.
Hasegawa Shumpei
Yamato Akihiro
Honda Giken Kogyo Kabushiki Kaisha
Lall Parshotam S.
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