| 摘要 |
A closed-loop mixture control system for an internal combustion engine comprises an intake air pressure sensor, an engine speed sensor, an exhaust gas sensor for detecting the concentration of a predetermined composition of exhaust emissions from said engine, said concentration varying as a function of the air-fuel ratio of a mixture supplied to the engine, a memory having a plurality of storage locations, and a data processor. The processor derives a basic quantity of fuel to be injected to the engine as a function of the detected pressure and engine speed, a mixture trimming value as a function of the detected concentration, a fuel injection trimming value dependent on the mixture trimming value, and stores the fuel injection trimming value into a memory location exclusively addressable as a function of the detected engine speed. The stored fuel injection trimming value is read as a function of the detected engine speed from the memory and summed with the basic quantity in response to which the fuel quantity to be injected to the engine is controlled.
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