Patent ID: 8464518
Filing Date: 2013-06-18
Classification: F01N,F02D,F02M,Y02T

Abstract:
1. An engine system including an engine, an exhaust system, and a fuel system that communicates with the engine, comprising: a controller that communicates with the fuel system and that controls a first quantity of liquid fuel to the engine at a first air/fuel (A/F) ratio and a second quantity of vapor fuel to the engine at a second A/F ratio to provide a fuel mixture having a third A/F ratio; and a secondary air source that operates in at least one of an on state and an off state and when operating in said on state supplies air to the exhaust system to increase said third A/F ratio, wherein said controller receives an indication of said at least one of said on state and said off state and adjusts said first quantity of liquid fuel and said second quantity of vapor fuel based on said indication, and wherein said controller further receives an exhaust A/F ratio from an exhaust A/F ratio sensor, compares said exhaust A/F ratio to a target A/F ratio range, and adjusts said first and second quantities when said exhaust A/F ratio is outside of said target A/F ratio range.