Patent ID: 7980231
Filing Date: 2011-07-19
Classification: B63H,F01N,F02B,F02M

Abstract:
1. A marine propulsion device comprising: an engine; an intake conduit configured to direct air into at least one combustion chamber of said engine; an exhaust conduit configured to direct exhaust gas from said at least one combustion chamber of said engine; an exhaust gas recirculation conduit connected in fluid communication between said exhaust conduit and said intake conduit; an exhaust gas recirculation valve disposed in fluid communication with said exhaust gas recirculation conduit and configured to selectively inhibit the flow of said exhaust gas through said exhaust gas recirculation conduit, said exhaust gas recirculation valve having an open state which permits said exhaust gas to flow through said exhaust gas recirculation conduit and a closed state which inhibits said exhaust gas from flowing through said exhaust gas recirculation conduit; an idle exhaust relief conduit connected in fluid communication with said exhaust conduit; an idle exhaust relief valve disposed in fluid communication with said idle exhaust relief conduit and configured to selectively inhibit the flow of gas through said idle exhaust relief conduit, said idle exhaust relief valve having an open state which permits said gas to flow through said idle exhaust relief conduit and a closed state which inhibits said gas from flowing through said idle exhaust relief conduit; and a sensor configured to provide a signal which is representative of an operating speed of said marine propulsion device.