Oxygen sensor control system

Details Oxygen sensor control system Oxygen sensor control system

F - Mech Eng,Light,Heat,Weapons

02

D

341/38.13

F02D 3/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 1105116

OXYGEN SENSOR CONTROL SYSTEM Abstract of the Disclosure 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 out- put of an oxygen sensor mounted in the exhaust of the engine. The control circuit biases the control mechanism toward a pre- determined 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 pos- sible malfunction.

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