Air-fuel ratio control system for an engine

Details Air-fuel ratio control system for an engine Air-fuel ratio control system for an engine

1988-03-18

1989-10-24

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123488, F02M 3900

Patent

active

048754536

ABSTRACT:
An air-fuel ratio control system for an engine, has an O.sub.2 -sensor, an actuator for controlling air-fuel ratio of mixture, and a feedback control system responsive to the output of the O.sub.2 -sensor for operating the actuator thereby controlling the air-fuel ratio. The feedback control system includes a peak-to-peak voltage producing circuit for producing an upper peak value signal and a lower peak value signal, a reference value circuit responsive to the upper and lower peak value signals for providing a reference value, a comparator for comparing the output of the O.sub.2 -sensor with the reference value and for producing an error signal, and a driving circuit responsive to the error signal for operating the actuator. A limiter is provided between the O.sub.2 -sensor and the peak-to-peak voltage producing circuit for cutting a part of the voltage exceeding a predetermined level.

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patent: 4627955 (1987-07-01), Takao
patent: 4651695 (1987-03-01), Ohtaki
patent: 4767520 (1988-08-01), Asakura

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