Patent Document ID: 4726344
Application ID: 06820149
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, the 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; first learning means for simultaneously learning a plurality of learning values related to a plurality of load regions of said engine; second learning means responsive to said first signal for selectively learning said learning values in accordance with changes of the engine load; means for repeatedly conducting the simultaneous learning of all said learning values at allowable learning times determined in relation to a lapse of time and for subsequently conducting the selective learning of said learning values after a finish of the simultaneous learning; means responsive to said first signal for selecting one of said load regions in accordance with the engine load and for selecting one of said learning values related to the selected load region; means responsive to said second signal for determining an amount of fuel for an optimum air-fuel ratio in accordance with the operating conditions of said engine and the selected learning value; and means for producing an output signal indicative of the determined amount of fuel and for applying said output signal to said fuel control means.