Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-08-31
1980-05-13
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123 32EE, 123 32EA, F02D 300
Patent
active
042023017
ABSTRACT:
An air-to-fuel ratio control mechanism in an internal combustion engine operates in partial response to the output of a control circuit, which circuit in turn is responsive to the output of an oxygen sensor mounted in the exhaust of the engine. The control circuit biases the control mechanism toward a predetermined desired air-to-fuel ratio, normally at or near stoichiometric. When the sensor output deviates above a first predetermined value or below a second predetermined value for longer than a predetermined time period, a comparator circuit provides a disabling signal which disconnects the control circuit from the air-to-fuel ratio control mechanism. At the same time, the disabling signal connects a predetermined signal to the air-to-fuel ratio control mechanism. This predetermined signal simulates a nominal control circuit output to maintain the air-to-fuel ratio close to stoichiometric or some other preferred setting such as a air/fuel ratio which is lean. An indicator is turned on by the disabling signal to alert the operator to possible malfunction.
REFERENCES:
patent: 3948228 (1976-04-01), Luchaco
patent: 3964258 (1976-06-01), Romano et al.
patent: 3986352 (1976-10-01), Casery
patent: 4019474 (1977-04-01), Nishimiya et al.
patent: 4073269 (1978-02-01), Herth et al.
patent: 4073270 (1978-02-01), Endo
Early Jack
Keith Carl D.
Mooney John J.
Engelhard Minerals & Chemicals Corporation
Myhre Charles J.
Nelli R. A.
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