Patent ID: 6325052
Filing Date: 2001-12-04
Classification: F02D,F02M

Abstract:
An apparatus for controlling a supply of a vapor fuel in a lean-burn internal combustion engine, comprising:a purge passageway for purging, into an intake system, a vapor fuel generated from fuel storing means for storing the fuel of said internal combustion engine;purge control means for controlling a quantity of the vapor fuel introduced into said intake system from said purge passageway in accordance with an operating state of said internal combustion engine;concentration learning means for detecting the concentration of the vapor fuel purged by said purge control means into said intake system; andcombustion control means for switching over a homogeneous combustion operation and a lean-burn operation in accordance with the operating state of said internal combustion engine,said concentration learning means including:learning judging means for judging whether or not the vapor fuel concentration is required to be learned during the lean-burn operation of said internal combustion engine; andoperation switch-over means for switching over said internal combustion engine from the lean-burn operation to the homogeneous combustion operation when said learning judging means judges that the concentration learning is required,wherein the concentration of the vapor fuel is learned under the homogeneous combustion operation.