Closed loop air fuel ratio control system using exhaust composition sensor

摘要

In a closed loop air fuel ratio control system, a throttle position detector senses full throttle operation. Means are provided to disable or clamp the closed loop to a minimum control level to permit reduction in the air fuel ratio below the stoichiometric value. The engine is allowed to operate with increased fuel to give more output power than is provided by the stoichiometric air fuel ratio.