Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1980-08-01
1982-09-14
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, 123491, 261 39E, G06G 770, F02M 700, F02M 112, F02B 300
Patent
active
043489966
ABSTRACT:
A system for controlling the air-fuel ratio for an internal combustion engine having an induction passage, an exhaust passage, a choke valve in the induction passage, an automatic choke device comprising a positive temperature coefficient (PTC) heater and a bimetal element connected to the choke valve, a detector for detecting the concentration of a constituent of exhaust gases passing through the exhaust passage, an electronic control circuit, an on-off type electromagnetic valve actuated by the output signal from the electronic control circuit for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supplier, and means for actuating the on-off type electromagnetic valve at a fixed duty ratio during cold engine operation. The electronic control circuit comprises a vacuum sensor for converting the amount of the induced air to an electric quantity, an engine temperature detector for converting the engine temperature to an electric quantity, a first calculating circuit for producing a proper desired air-fuel mixture ratio signal from the output signals of the vacuum sensor and of the engine temperature detector, and a second calculation circuit for producing an actual air-fuel ratio signal from output signals of the vacuum sensor and of the PTC heater. A summing circuit for summing the proper air-fuel ratio signal and the actual air-fuel ratio signal produces a pulse duty ratio correcting signal which is applied to the electronic control circuit for correcting the fixed duty ratio.
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patent: 4007720 (1977-02-01), Brettenschnieder et al.
patent: 4109615 (1978-08-01), Asano
patent: 4173956 (1979-11-01), Ikeura et al.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nelli Raymond A.
Nissan Motor Co,. Ltd.
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