Cooling systems for marine propulsion devices having cooling water sprayers for cooling exhaust conduit

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a cooling water sprayer that is configured to spray a flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• a temperature sensor located downstream of the cooling water sprayer and configured to sense temperature of the exhaust gas and cooling water;
• and
• a controller configured to identify a fault condition associated with the cooling water sprayer based on the temperature of the exhaust gas and cooling water;
• wherein the cooling water sprayer comprises a sprayer body that radially extends into the axially elongated exhaust conduit and conveys the flow of cooling water radially into the axially elongated exhaust conduit and a nozzle that sprays the flow of cooling water radially outwardly toward the inner diameter;
• and
• wherein the temperature sensor radially extends into the axially elongated exhaust conduit and is positioned downstream with respect to the cooling water sprayer and close enough to the cooling water sprayer so that the nozzle directly sprays a portion of the flow of cooling water onto the temperature sensor.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a cooling water sprayer that is configured to spray a flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• a temperature sensor located downstream of the cooling water sprayer and configured to sense temperature of the exhaust gas and cooling water;
• and
• a controller configured to identify a fault condition associated with the cooling water sprayer based on the temperature of the exhaust gas and cooling water;
• wherein the cooling water sprayer comprises a sprayer body that radially extends into the axially elongated exhaust conduit and conveys the flow of cooling water radially into the axially elongated exhaust conduit and a nozzle that sprays the flow of cooling water radially outwardly toward the inner diameter;
• and
• wherein the temperature sensor radially extends into the axially elongated exhaust conduit and is positioned downstream with respect to the cooling water sprayer and set at an angle to the cooling water sprayer so that the nozzle directly sprays a portion of the flow of cooling water onto the temperature sensor.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a cooling water sprayer that is configured to spray a flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• a temperature sensor located downstream of the cooling water sprayer and configured to sense temperature of the exhaust gas and cooling water;
• and
• a controller configured to identify a fault condition associated with the cooling water sprayer based on the temperature of the exhaust gas and cooling water;
• wherein the cooling water sprayer comprises a sprayer body that radially extends into the axially elongated exhaust conduit and conveys the flow of cooling water radially into the axially elongated exhaust conduit and a nozzle that sprays the flow of cooling water radially outwardly toward the inner diameter;
• and
• wherein the temperature sensor radially extends into the axially elongated exhaust conduit and is positioned downstream with respect to the cooling water sprayer and within a spray pattern of the cooling water sprayer.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a cooling water sprayer that is configured to spray a flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• a temperature sensor located downstream of the cooling water sprayer and configured to sense temperature of the exhaust gas and cooling water;
• and
• a controller configured to identify a fault condition associated with the cooling water sprayer based on the temperature of the exhaust gas and cooling water;
• wherein the cooling water sprayer comprises a sprayer body that radially extends into the axially elongated exhaust conduit and conveys the flow of cooling water radially into the axially elongated exhaust conduit and a nozzle that sprays the flow of cooling water radially outwardly toward the inner diameter;
• and
• wherein the controller is further configured to automatically limit a power function of the marine propulsion device when the controller identifies the fault condition.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys an axial flow of exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a first cooling water sprayer that is configured to spray a first flow of cooling water perpendicularly radially outwardly relative to the axial flow of exhaust gas toward an inner diameter of the axially elongated exhaust conduit;
• and
• a second cooling water sprayer that is configured to spray a second flow of cooling water radially outwardly toward the inner diameter of the axially elongated exhaust conduit.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a first cooling water sprayer that is configured to spray a first flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• and
• a second cooling water sprayer that is configured to spray a second flow of cooling water radially outwardly toward the inner diameter of the axially elongated exhaust conduit;
• a first conduit that conveys the first flow of cooling water to the first cooling water sprayer and a second conduit that conveys the second flow of cooling water to the second cooling water sprayer, wherein the first and second conduits are separate from each other;
• and
• a first filter that filters the first flow of cooling water in the first conduit and a second filter that filters the second flow of cooling water in the second conduit;
• and
• wherein the first filter is located in a cooling water jacket on the exhaust conduit and wherein the second filter is located in an inlet water fitting on the exhaust conduit.

A marine propulsion device comprising:

• an internal combustion engine;
• an axially elongated exhaust conduit that conveys exhaust gas from the upstream internal combustion engine to a downstream outlet;
• a first cooling water sprayer that is configured to spray a first flow of cooling water radially outwardly toward an inner diameter of the axially elongated exhaust conduit;
• and
• a second cooling water sprayer that is configured to spray a second flow of cooling water radially outwardly toward the inner diameter of the axially elongated exhaust conduit;
• wherein the first and second cooling water sprayers are axially aligned with respect to the axially elongated exhaust conduit.