| 摘要 |
This specification discloses an air-fuel ratio control system for an internal combustion engine which can provide air-fuel feedback control at air-fuel ratios lean of stoichiometry while using an air-fuel sensor capable of only indicating stoichiometry. A control means pulses the air-fuel ratio to determine the magnitude of pulse necessary to cross stoichiometry. Thus the air-fuel ratio can be maintained at a desired offset from stoichiometry.
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