System for feedback control of air/fuel ratio in IC engine with

Details System for feedback control of air/fuel ratio in IC engine with System for feedback control of air/fuel ratio in IC engine with

1982-06-17

1984-02-07

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, 204426, 204427, 204429, G01N 2746

Patent

active

044301910

ABSTRACT:
An air/fuel ratio control system including an oxygen sensor disposed in the exhaust gas to provide a feedback signal. The oxygen sensor is of the solid electrolyte concentration cell type having a heater and is operated with supply of a DC current to the concentration cell to maintain a reference oxygen partial pressure therein. A fuel feed control circuit in this system shifts its closed-loop control function to open-loop aiming at a lower air/fuel ratio if the output of the oxygen sensor continues to indicate that actual air/fuel ratio remains on one side of the intended air/fuel ratio due to breaking of the heater. To prevent the engine from stalling or operating unstably due to excessive increase in the air/fuel ratio before the shift to open-loop control, the system includes means for detecting breaking of the heater and immediately interrupting the current supply to the concentration cell in the oxygen sensor thereby forcing the sensor to put out an output which is indicative of a very high air/fuel ratio and, hence, causes the control circuit to lower the air/fuel ratio before the interruption of the closed-loop control.

REFERENCES:
patent: 4224113 (1980-09-01), Kimura et al.
patent: 4332225 (1982-06-01), Cox et al.
patent: 4359030 (1982-11-01), Sone et al.

Affiliated with

Also associated with

Rating

System for feedback control of air/fuel ratio in IC engine with does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for feedback control of air/fuel ratio in IC engine with , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for feedback control of air/fuel ratio in IC engine with will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2160523