Engine controller

An engine controller comprising

• a fuel supplier, and
• one or more processors,
• the fuel supplier comprising:
• a fuel tank configured to store fuel;
• a sub-tank provided in the fuel tank;
• a fuel pump provided in the sub-tank and configured to boost the fuel and supply the fuel to an engine of a vehicle;
• a return pipe configured to return, to the sub-tank, surplus fuel within the fuel supplied from the fuel pump to the engine;
• and
• a jet pump disposed on the return pipe and configured to transfer the fuel stored in the fuel tank to the sub-tank by using a venturi effect by the surplus fuel to be returned to the sub-tank,
• the one or more processors being configured to control an amount of fuel injection and an amount of intake air of the engine, wherein
• the one or more processors are configured to
• determine, based on an operation state of the engine, whether an operation point of the engine is in an engine operation range where an amount of the surplus fuel to be returned to the jet pump is smaller than a predetermined amount,
• upon entry into the engine operation range where the amount of the surplus fuel to be returned to the jet pump is smaller than the predetermined amount, obtain an amount of remaining fuel in the sub-tank, based on a travel state of the vehicle,
• accumulate the amount of fuel injection after the entry into the engine operation range where the amount of the surplus fuel to be returned to the jet pump is smaller than the predetermined amount, to obtain an accumulated amount of fuel injection, and
• when the amount of remaining fuel in the sub-tank is smaller than the accumulated amount of fuel injection, put limitation on maximum torque for each engine speed of the engine.