Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1980-06-20
1982-07-06
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, 60276, 204 15, 204195S, G01N 2758, F02D 3300, G01N 2746, F02D 304
Patent
active
043377467
ABSTRACT:
A system for feedback control of air/fuel ratio in an internal combustion engine operated with a nonstoichiometric air-fuel mixture. The control system includes two oxygen-sensitive air/fuel ratio sensors which are of the concentration cell type having a solid electrolyte layer provided with two electrode layers and both disposed in an exhaust passage substantially at the same section. The first sensor is supplied with a constant DC current to cause migration of oxygen ions through the solid electrolyte layer and exhibits a slope output characteristic when a lean mixture or a rich mixture is supplied to the engine, depending on the direction of flow of the current. The second sensor exhibits on-off type output characteristic and can discriminate between a lean mixture and a rich mixture. A control circuit to produce a fuel feed rate control signal based on the output of the first sensor includes a discriminating means for ascertaining whether the output of the first sensor is truly attributed to the slope output characteristic with reference to the output of the second sensor.
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patent: 4121548 (1978-10-01), Hattori et al.
patent: 4157282 (1979-06-01), Riddel
patent: 4178793 (1979-12-01), Bremer et al.
patent: 4194471 (1980-03-01), Baresel
patent: 4226221 (1980-10-01), Asano
patent: 4226692 (1980-10-01), Isenberg
patent: 4237829 (1980-12-01), Asano et al.
patent: 4264425 (1981-04-01), Kimura et al.
Nelli Raymond A.
Nissan Motor Co,. Ltd.
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