Control apparatus for fuel supply apparatus

A fuel supply apparatus for use in an engine system, the engine system including an engine including a fuel injection valve, the fuel supply apparatus comprising:

• a fuel tank,
• a supply pipe connected to the fuel injection valve,
• a fuel pump configured to supply fuel in the fuel tank to the supply pipe,
• a check valve disposed within the supply pipe,
• a relief channel connected to the supply pipe on a fuel injection valve side of the supply pipe with respect to the check valve,
• a relief valve disposed within the relief channel, and
• a control apparatus for the fuel supply apparatus comprising a central processing unit programmed to execute, when the fuel is supplied to the fuel tank, and after the engine system is started, relief pressure control for driving the fuel pump to open the relief valve until a predetermined termination condition is satisfied, wherein:
• the central processing unit is programmed to drive the fuel pump to rotate at a predetermined rotation speed as the relief pressure control;
• and
• the predetermined termination condition is a condition that a change amount of an actuation current of the fuel pump in a predetermined period is equal to or smaller than a predetermined change amount.

A fuel supply apparatus for use in an engine system, the engine system including an engine including a fuel injection valve, the fuel supply apparatus comprising:

• a fuel tank,
• a supply pipe connected to the fuel injection valve,
• a fuel pump configured to supply fuel in the fuel tank to the supply pipe,
• a check valve disposed within the supply pipe,
• a relief channel connected to the supply pipe on a fuel injection valve side of the supply pipe with respect to the check valve,
• a relief valve disposed within the relief channel, and
• a control apparatus for the fuel supply apparatus comprising a central processing unit programmed to execute, when the fuel is supplied to the fuel tank, and after the engine system is turned on, relief pressure control for driving the fuel pump to open the relief valve until a predetermined termination condition is satisfied, and to stabilize a fuel pressure inside the supply pipe at a threshold at which the relief valve is configured to be opened, wherein the predetermined termination condition is a condition that a cumulative value of consumed flow rate variables, calculated as a sum of the consumed flow rates of a port injection valve and a direct injection valve, is equal to or larger than a predetermined value.