Electronic-injection fuel-supply system
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsMassimo Mattioli, Paolo Pasquali, Luca Mancini
Life of this patent
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Abstract
Described herein is an electronic-injection fuel-supply system for an internal-combustion engine having at least one injector and a fuel pump; the fuel pump is provided with: a variable-volume pumping chamber; a one-way intake valve; a one-way delivery valve; a mobile piston that integrates within it the intake valve and is coupled to the pumping chamber to vary cyclically the volume of the pumping chamber itself; and an actuator device that impresses a reciprocating motion on the piston and has an electromagnetic actuator for actuating the piston during an intake phase and a spring for actuating the piston during a delivery phase.
Claims19
An electronic-injection fuel-supply system for an internal-combustion engine that comprises at least one injector having a desired fuel-supply pressure, a fuel pump, and a connection pipe connecting the fuel pump hydraulically to the at least one injector;
- the fuel pump comprising:
- a variable-volume pumping chamber;
- a one-way intake valve;
- a one-way delivery valve;
- a mobile piston is coupled to the variable-volume pumping chamber to vary cyclically the volume of the variable-volume pumping chamber and the piston integrates within it the one-way intake valve;
- and
- an electromagnetic actuator device, which impresses a reciprocating motion on the piston, comprises an electromagnetic actuator for actuating the piston during an intake phase, and comprises a spring for actuating the piston during a delivery phase,
- wherein the electromagnetic actuator comprises:
- a coil;
- a fixed magnetic pole, which is set within a housing body and has a central hole to enable flow of fuel along a central supply channel of the housing body;
- and a mobile anchor, which is set within the housing body and has a central hole to enable flow of the fuel along the supply channel, is rigidly connected to the piston and is designed to be magnetically attracted by the fixed magnetic pole when the coil is excited,
- wherein the spring is sized so that the force of pre-loading exerted by the spring on the piston is equal to the useful area of the piston multiplied by the desired fuel-supply pressure so that the spring is able to push the fuel out of the variable-volume pumping chamber through the one-way delivery valve and towards the connection pipe giving out into the at least one injector only if a pressure of fuel within the connection pipe is lower than the desired fuel-supply pressure, and
- wherein the spring is set within the central hole of the mobile anchor and is compressed between the fixed magnetic pole and the piston.
An electronic-injection fuel-supply system for an internal-combustion engine that comprises at least one injector and a fuel pump;
- the fuel pump comprising:
- a variable-volume pumping chamber;
- a one-way intake valve;
- a one-way delivery valve;
- a mobile piston is coupled to the variable-volume pumping chamber to vary cyclically the volume of the pumping chamber and the piston integrates within it the one-way intake valve;
- and
- an actuator device, which impresses a reciprocating motion on the piston, comprises an electromagnetic actuator for actuating the piston during an intake phase, and comprises a spring for actuating the piston during a delivery phase,
- wherein the electromagnetic actuator comprises:
- a coil;
- a fixed magnetic pole, which is set within a housing body and has a central hole to enable flow of fuel along a central supply channel of the housing body;
- and a mobile anchor, which is set within the housing body, has a central hole to enable flow of the fuel along the central supply channel, is rigidly connected to the piston, and is designed to be magnetically attracted by the fixed magnetic pole when the coil is excited,
- wherein the spring is sized so that a force of pre-loading exerted by the spring on the piston is equal to a useful area of the piston multiplied by a desired fuel-supply pressure,
- wherein the spring is set within the central hole of the mobile anchor and is compressed between the fixed magnetic pole and the piston.
Dependencies are inferred from the claim text.