초록 ▼

An internal combustion engine has a system, including diagnostics, for providing oxygen enriched air so as to control emissions of unburned hydrocarbons and carbon monoxide. The system includes the capability of determining whether the oxygen enrichment system is providing suitable mass flow to the

An internal combustion engine has a system, including diagnostics, for providing oxygen enriched air so as to control emissions of unburned hydrocarbons and carbon monoxide. The system includes the capability of determining whether the oxygen enrichment system is providing suitable mass flow to the engine and whether oxygen enrichment is available according to the specifications of the enrichment device.

대표청구항 ▼

A diagnostic system for verifying proper operation of an internal combustion engine having an air enrichment system for providing the engine with an additional oxygen enriched airflow, with said diagnostic system comprising: a state identifier for identifying and indicating an appropriate engine ope

A diagnostic system for verifying proper operation of an internal combustion engine having an air enrichment system for providing the engine with an additional oxygen enriched airflow, with said diagnostic system comprising: a state identifier for identifying and indicating an appropriate engine operating condition during which the air enrichment system may be activated without disturbing the engine\s operation; an A/F correction system for determining an air/fuel correction factor whose value is proportional to the difference between a desired engine air/fuel ratio and the engine\s actual air/fuel ratio; a primary airflow sensing system for determining the mass airflow rate required by the engine; and a controller operatively connected with said state identifier, with said A/F correction system, and with said engine airflow sensing system, with said controller performing a diagnosis of the air enrichment system according to the steps of: determining the engine\s primary airflow prior to activation of the air enrichment system; determining the engine\s air/fuel correction factor prior to activation of the air enrichment system; activating the air enrichment system during an appropriate operating condition indicated by said state identifier; comparing the engine\s primary airflow following activation of the air enrichment system with the primary airflow prior to activation of the air enrichment system, and setting an airflow flag in the event that the value of the primary airflow does not change by more than a predetermined amount; determining the engine\s air/fuel correction factor following activation of the oxygen enrichment system and comparing the value of the correction factor following activation of the air enrichment system with the air/fuel correction factor prior to activation of the oxygen enrichment system and setting an A/F correction flag in the event that the value of the air/fuel correction factor changes by more than a predetermined amount; and disabling the air enrichment system in the event that either the airflow flag or the A/F correction flag has been set.