초록 ▼

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 d

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.

대표청구항 ▼

An air-fuel ratio control means for an internal combustion engine, said air-fuel ratio control means including: stoichiometric sensing means for providing an output in response to a stoichiometric condition so that it can be determined whether an air-fuel ratio is rich or lean of stoichiometry; refe

An air-fuel ratio control means for an internal combustion engine, said air-fuel ratio control means including: stoichiometric sensing means for providing an output in response to a stoichiometric condition so that it can be determined whether an air-fuel ratio is rich or lean of stoichiometry; reference means for providing a desired air-fuel ratio; fuel metering means which is electronically controllable for injecting a given amount of fuel; and adjustment means for pulsing a base air-fuel ratio, comparing the resulting perturbed air-fuel ratio with a stoichiometric ratio, and for changing the base air-fuel ratio so that the next perturbation produces less of a change from stoichiometry thus permitting the base air-fuel ratio to be maintained at an offset from stoichiometry.