Feedback emission control for internal combustion engines with v

Details Feedback emission control for internal combustion engines with v Feedback emission control for internal combustion engines with v

1977-02-09

1979-03-06

Myhre, Charles J.

Internal-combustion engines

Noncompression

123119EC, 60276, 60285, 123 32EK, F02B 308, F02M 712, F01N 308

Patent

active

041424824

ABSTRACT:
Emission control apparatus for internal combustion engines is provided with a sensor for detecting the concentration of a particular exhaust composition in the emissions from the engine. A signal indicating the deviation of the mixture ratio from a controlled point is generated by comparing the output from the sensor with a reference level, the signal being modified in amplitude according to a predetermined control characteristic and used to regulate the air-fuel mixture ratio at the desired control point. The varying magnitude of the sensed concentration is smoothed into a signal of slowly varying magnitude which is used to control the reference level so that error introduced into the deviation indicating signal due to the change with time in the output performance of the exhaust composition sensor is self-compensated. A level sensor is provided to detect when the reference level reaches an end of the control range to change the operating mode of the engine from closed-loop to open-loop mode.

REFERENCES:
patent: 3815561 (1974-06-01), Seitz
patent: 3834361 (1974-09-01), Keely
patent: 3938479 (1976-02-01), Oberstadt
patent: 4015566 (1977-04-01), Wahl
patent: 4019474 (1977-04-01), Nishimiya et al.
patent: 4030462 (1977-06-01), Sassayama et al.

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