An object of the present invention is to obtain a high pressure fuel supply pump capable of reducing pressure pulsation that occurs in a low pressure pipe, preventing damage to the low pressure pipe, or reducing noise due to vibrations of the low pressure pipe. The present invention provides a high pressure fuel supply pump of a type in which, from a fuel suction port connected to a low pressure pipe provided upstream of a fuel, a low pressure passage, an electromagnetic suction valve driven by an electromagnetic force, a pressurizing chamber in which the volume thereof is increased or reduced by a plunger that is reciprocatingly moved by being guided by a cylinder, and a discharge valve provided at an outlet of the pressurizing chamber are sequentially arranged, a fuel is sucked to the pressurizing chamber through the electromagnetic suction valve, the amount of a part of the fuel, which is sucked to the pressurizing chamber, to be returned to the low pressure passage side is adjusted so that the amount of the fuel to be discharged through the discharge valve is controlled, and the high pressure fuel supply pump includes a backflow suppression mechanism for suppressing backflow of fuel from the fuel from the fuel suction portion to the low pressure pipe side.

The control device controls a fuel pump which repeatedly executes a discharge operation of pressurizing and discharging fuel in a pressurizing chamber with the pressurizing member. Furthermore, the control device includes: a pressurizing chamber temperature obtaining unit which obtains a pressurizing chamber temperature which is a temperature of the fuel in the pressurizing chamber; and a discharge amount control unit which increases a fuel discharge amount by one discharge operation of the fuel pump when the pressurizing chamber temperature obtained by the pressurizing chamber temperature obtaining unit is higher than a threshold value.

When a pressure of fuel is intensified using a pressure intensifier, an electronic control unit is configured to set a target common rail pressure to be higher as a fuel leakage volume that is a volume of fuel leaking from a common rail to a fuel tank becomes larger until a three-way valve is switched from a state in which the pressure intensifier is connected to the common rail to a state in which the pressure intensifier is connected to the fuel tank.

The invention relates to an electromagnetically actuatable intake valve for a high-pressure pump of a fuel injection system, in particular a common rail injection system, comprising a magnet coil (1) for acting on an armature (2) which is received and guided such that it can be moved with a reciprocating movement in a central recess (3) of a valve body (4), wherein a pole core (6) which is connected via a sleeve (7) to the valve body (4) lies opposite the armature (2) at a working air gap (5). According to the invention, the valve body (4) has a circumferential cut-out (9) within an inner circumferential surface (8) which delimits the recess (3), which cut-out (9) divides the inner circumferential surface (8) into an upper and a lower guide region (10, 11). The invention also relates to a high-pressure pump for a fuel injection system, in particular a common rail injection system, comprising said type of intake valve.

A high pressure pump is disclosed. The high pressure pump comprises a compression chamber having an inlet for connecting to a fluid supply to intake a fluid, and an outlet, an inlet check valve between the compression chamber and the inlet, a digital inlet valve between the compression chamber and the inlet check valve, a variable volume chamber connected to the compression chamber through a manifold and the digital inlet valve, and a plunger or piston configured to compress the fluid in the compression chamber and the variable volume chamber.

A high-pressure pump includes: a low-pressure chamber, into which low-pressure fuel discharged from a low-pressure pump flows; a pressurizing chamber, which pressurizes the low-low-pressure fuel; and a leak chamber, into which leaked fuel from the pressurizing chamber flows. The leaked fuel of the leak chamber is suctioned into and is pressurized in the pressurizing chamber together with the low-pressure fuel of the low-pressure chamber, so that the leaked fuel is discharged to an outside of the high-pressure pump as high-pressure fuel. Furthermore, a suction check valve, which is placed between the low-pressure chamber and the leak chamber, limits backflow of the leaked fuel of the leak chamber to the low-pressure chamber when the high-pressure pump does not supply the high-pressure fuel.

An object of the present invention is to prevent generation of wear at a rod collision portion in an electromagnetic intake valve of a high-pressure fuel supply pump by reducing inclinations of the intake valve and a rod.

A structure of the electromagnetic intake valve of the high-pressure fuel supply pump is configured as follows. A seat portion of an intake valve and a guide portion of a rod are configured as an integral part, and further, a rod guide is made to have a sufficiently long length so that it is possible to perform guide at one portion. Further, the intake valve seat portion and a surface where the rod collides with the intake valve are formed on the same plane.

A shuttle valve for a control valve coupled to an electronic fuel injector is disclosed. The shuttle valve may include a shuttle valve first end including an armature attachment portion operably coupled to an armature of the control valve and a shuttle valve second end opposite the shuttle valve first end defining a sealing portion of the control valve including an annular sealing surface. A valve guide portion may extend axially along a portion of the shuttle valve between the first and second ends. Furthermore, an engagement surface portion may be defined along the valve guide portion that is slidably engaged with a valve bore. Moreover, the shuttle valve may include a non-engagement surface portion defined along the valve guide portion, wherein the non-engagement surface is a non-continuous surface around a circumference of the valve guide portion and wherein the non-engagement surface is interspersed between portions of the engagement surface.

A method for controlling a digital high-pressure pump, the control method including the following consecutive steps when the internal combustion engine does not manage to start during the starting procedure: checking the external parameters of the internal combustion engine; measuring a physical parameter at the high-pressure output, applying an electrical detachment control signal as a replacement for the electrical control signal to the high-pressure pump during the starting procedure when the physical parameter measured at the high-pressure output is less than or equal to a reference value, and stopping the starting procedure after a given time when the physical parameter measured at the high-pressure output is greater than the reference value.

A fuel injection pump (100) provided in a diesel engine, including: an electromagnetic spill valve (20) configured to adjust a fuel injection amount by releasing a pressurized fuel with opening/closing of a spill valve body (23); and an ECU (Engine Control Unit, 50) configured to form a current waveform of drive current of the electromagnetic spill valve (20). The ECU (50), during the warm state, detects a valve-close timing of the electromagnetic spill valve (20), forms an optimum current waveform of drive current based on the detected valve-close timing, and applies drive current with thus formed optimum current waveform to the electromagnetic spill valve (20), whereas, during the cold state, the ECU (50) applies only drive current with a pre-set current waveform to the electromagnetic spill valve (20).