System controlling any air/fuel ratio with stoichiometric...

Details System controlling any air/fuel ratio with stoichiometric... System controlling any air/fuel ratio with stoichiometric...

F - Mech Eng,Light,Heat,Weapons

02

B

341/38.13

F02B 3/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 1084143

SYSTEM CONTROLLING ANY AIR/FUEL RATIO WITH STOICHIOMETRIC SENSOR AND ASYMMETRICAL INTEGRATION ABSTRACT OF THE DISCLOSURE In a fuel management system for an internal combustion engine, a system utilizing a stoichiometric gas sensor in the exhaust gas system for supplying an electrical signal to an asymmetrical integrator which controls and maintains any desired air/fuel ratio to the engine. By means of the system, the air/fuel ratio may be maintained slightly richer than stoichiometric for optimum catalytic converter operation. For very lean air/fuel ratios, a delay circuit is used in the system to continue the time the fuel mixture is in a lean condition before the mixture is controllably changed to a rich mixture for sensing by the sensor. -1-

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