Disclosed is a method for controlling a fuel pump for a motor vehicle, including determining if a set amount of fuel to be compressed is less than the minimum volume that can be delivered by the pump and, if this is the case, determining a new set amount of fuel to be compressed equal to the product of a number of compressions of a volume equal to the set amount of fuel to be compressed required to achieve at least the minimum volume that can be delivered and the set amount of fuel to be compressed; transmitting the new set amount of fuel to be compressed to the fuel pump; and subsequently disabling the fuel pump for a number of occurrences of the set amount of fuel equal to the number of compressions of a volume equal to the set amount of fuel to be compressed.

Disclosed is a method for controlling a fuel pump for a motor vehicle, including determining if a set amount of fuel to be compressed is less than the minimum volume that can be delivered by the pump and, if this is the case, determining a new set amount of fuel to be compressed equal to the product of a number of compressions of a volume equal to the set amount of fuel to be compressed required to achieve at least the minimum volume that can be delivered and the set amount of fuel to be compressed; transmitting the new set amount of fuel to be compressed to the fuel pump; and subsequently disabling the fuel pump for a number of occurrences of the set amount of fuel equal to the number of compressions of a volume equal to the set amount of fuel to be compressed.

Various methods and systems are provided for a pressure relief valve of a fuel system. In one example, a valve includes a first chamber in fluid communication with a first fuel line, a second chamber in fluid communication with a second fuel line and in fluid communication with a fuel storage tank, a piston separating the first chamber from the second chamber, and a needle coupled to the piston and controlling a flow passage between the second fuel line and the second chamber, where the piston and needle are sized such that a force applied on the piston by the first chamber parallel to an axis of movement of the piston maintains the needle in a closed position when the first fuel line flows fuel at a first pressure and the second fuel line flows fuel at a second pressure, the second pressure greater than the first pressure.

Various methods and systems are provided for a pressure relief valve of a fuel system. In one example, a valve includes a first chamber in fluid communication with a first fuel line, a second chamber in fluid communication with a second fuel line and in fluid communication with a fuel storage tank, a piston separating the first chamber from the second chamber, and a needle coupled to the piston and controlling a flow passage between the second fuel line and the second chamber, where the piston and needle are sized such that a force applied on the piston by the first chamber parallel to an axis of movement of the piston maintains the needle in a closed position when the first fuel line flows fuel at a first pressure and the second fuel line flows fuel at a second pressure, the second pressure greater than the first pressure.

A control device for an fuel pump includes an electronic control unit. The fuel pump is an electric fuel pump configured to supply fuel to a fuel pipe to which a fuel injection valve disposed within a cylinder of an engine is coupled. The electronic control unit executes an inter-injection discharge control of executing fuel discharge from the fuel pump at a predetermined timing between an Nth fuel injection and an (N+1)th fuel injection from the fuel injection valve. The electronic control unit changes a discharge ratio in accordance with an operational state of the internal combustion engine during the execution of the inter-injection discharge control. The discharge ratio is a ratio of the number of times of fuel discharge from the high-pressure fuel pump to the number of times of fuel injection from the fuel injection valve.

A control device for an fuel pump includes an electronic control unit. The fuel pump is an electric fuel pump configured to supply fuel to a fuel pipe to which a fuel injection valve disposed within a cylinder of an engine is coupled. The electronic control unit executes an inter-injection discharge control of executing fuel discharge from the fuel pump at a predetermined timing between an Nth fuel injection and an (N+1)th fuel injection from the fuel injection valve. The electronic control unit changes a discharge ratio in accordance with an operational state of the internal combustion engine during the execution of the inter-injection discharge control. The discharge ratio is a ratio of the number of times of fuel discharge from the high-pressure fuel pump to the number of times of fuel injection from the fuel injection valve.

A control device for a motor-driven fuel pump adapted for an internal combustion engine is provided. The fuel pump includes a cylinder, a mover in the cylinder, and an electric actuator configured to move the mover. The control device is configured to perform energization control on the electric actuator to reciprocate the mover so that the fuel pump draws in and discharges fuel. The control device is also configured to control a discharge count and a unit discharge amount based on an operating state of the internal combustion engine. The discharge count is a number of times of discharging fuel from the fuel pump to the fuel pipe during a period between a fuel injection from the fuel injection valve and the next fuel injection, and the unit discharge amount is an amount of fuel for one fuel discharge from the fuel pump.

A control device for a motor-driven fuel pump adapted for an internal combustion engine is provided. The fuel pump includes a cylinder, a mover in the cylinder, and an electric actuator configured to move the mover. The control device is configured to perform energization control on the electric actuator to reciprocate the mover so that the fuel pump draws in and discharges fuel. The control device is also configured to control a discharge count and a unit discharge amount based on an operating state of the internal combustion engine. The discharge count is a number of times of discharging fuel from the fuel pump to the fuel pipe during a period between a fuel injection from the fuel injection valve and the next fuel injection, and the unit discharge amount is an amount of fuel for one fuel discharge from the fuel pump.

A fuel pump includes a mechanical regulating valve arranged in a pump body which modulates the pressure in a high pressure space so that the pressure matches the engine demand. Modulation by the regulating valve requires adjustment of the inlet fuel quantity, adjustment of the volume of the high pressure space, and control of a return fluid communication enabling fuel to exit the high pressure reservoir.

A fuel pump includes a mechanical regulating valve arranged in a pump body which modulates the pressure in a high pressure space so that the pressure matches the engine demand. Modulation by the regulating valve requires adjustment of the inlet fuel quantity, adjustment of the volume of the high pressure space, and control of a return fluid communication enabling fuel to exit the high pressure reservoir.