초록 ▼

A control system for an internal combustion engine having a pressurized gaseous fuel source, a control valve for regulating the amount of gaseous fuel supplied from the pressurized gaseous fuel source, and an intake passage in which the gaseous fuel, the amount of which has been regulated by the con

A control system for an internal combustion engine having a pressurized gaseous fuel source, a control valve for regulating the amount of gaseous fuel supplied from the pressurized gaseous fuel source, and an intake passage in which the gaseous fuel, the amount of which has been regulated by the control valve, is mixed with intake air and supplied to the engine as an air-fuel mixture. An ECU of the control system controls the air-fuel ratio of the air-fuel mixture to be supplied to the engine by regulating the amount of the gaseous fuel through the control valve, and various sensors detect operating conditions of the engine. The ignition timing of the engine is calculated based on the detected operating conditions, and when the air-fuel ratio of the air-fuel mixture is in a predetermined lean limit region, the output of the engine is controlled by correcting the ignition timing.

대표청구항 ▼

In a control system for an internal combustion engine having a pressurized gaseous fuel source, a control valve for regulating an amount of gaseous fuel supplied from said pressurized gaseous fuel source, and an intake passage in which said gaseous fuel, the amount of which has been regulated by sai

In a control system for an internal combustion engine having a pressurized gaseous fuel source, a control valve for regulating an amount of gaseous fuel supplied from said pressurized gaseous fuel source, and an intake passage in which said gaseous fuel, the amount of which has been regulated by said control valve, is mixed with intake air and supplied to said engine as an air fuel mixture, said engine being a throttleless type in which an output of said engine is controlled solely by controlling a flow rate of said gaseous fuel supplied to said engine without controlling an amount of intake air supplied to said engine, the improvement comprising: air-fuel ratio control means for controlling an air-fuel ratio of said air-fuel mixture to be supplied to said engine by regulating the amount of said gaseous fuel through said control valve; operating condition-detecting means for detecting operating conditions of said engine; ignition timing-calculating means for calculating an optimum value of ignition timing of said engine, based on said operating conditions detected by said operating condition-detecting means; and ignition timing-correcting means for decreasing the output of said engine by retarding the ignition timing of said engine when the air-fuel ratio of said air-fuel mixture is in a predetermined lean limit region, while controlling the ignition timing of said engine to said optimum value calculated by said ignition timing-calculating means before the air-fuel ratio of said air-fuel mixture reaches said predetermined lean limit region.