Patent Document ID: 4705002
Application ID: 06846552
Patent Flag: 1

Claim One:
1. An electronic air-fuel mixture control system for an internal combustion engine, having an induction passage for conducting air-fuel mixture into said engine, fuel control means for controlling the amount of fuel metered into said air induction passage, and throttle means for controlling the amount of air flowing into said engine through said induction passage, said control system comprising: first detecting means for producing a first signal indicative of the load acting on said engine; second detecting means for producing a second signal indicative of the operating conditions of said engine; means responsive to said first signal for selecting one of plural learning values in accordance with the engine load, said plural learning values being related to a plurality of load regions of said engine; learning means for learning the selected learning value, said learning means being arranged to prohibit learning of the selected learning value when a difference between the selected learning value and an adjacent learning value is more than a predetermined allowable value; means responsive to said second signal for determining an amount of fuel for an optimum air-fuel ratio in accordance with the operation conditions of said engine and the selected learning value; and means for producing an output signal indicative of the determined amount of fuel to apply it to said fuel control means.