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公开(公告)号：EP4350139A1
公开(公告)日：2024-04-10
申请号：EP23201578.4
申请日：2023-10-04
发明人： SPIZZIRRI, Armando , MARIANELLO, Riccardo , MANCINI, Luca , PETRECCHIA, Stefano , PETRONE, Michele
摘要： A method to control a fuel injection system (1) for an internal combustion engine and provided with a fuel pump (4). The fuel pump (4) has: a pumping chamber (14); a piston (15) mounted so as to slide within the pumping chamber (14); an intake duct (17), which ends in the pumping chamber (14) and is provided with an intake valve (18); a delivery duct (19), which starts from the pumping chamber (14) and is provided with a delivery valve (20); and a flow rate adjustment device (6), which is coupled to the intake valve (18) and can be controlled so as to prevent the intake valve (18) from closing or allow it to close when a fuel pressure inside the pumping chamber (14) exceeds a fuel pressure in the intake duct (17). The control method presents the steps of: detecting when the internal combustion engine is stopped; and controlling, after the internal combustion engine has been stopped, the flow rate adjustment device (6) to allow the intake valve (18) to close.
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公开(公告)号：EP4242448A1
公开(公告)日：2023-09-13
申请号：EP23161178.1
申请日：2023-03-10
发明人： SPIZZIRRI, Armando , MARIANELLO, Riccardo , MANCINI, Luca , PETRECCHIA, Stefano , PETRONE, Michele , PASQUALI, Paolo
摘要： A valve assembly (7) for a fuel pump (1) and having: a one-way outlet closing valve (8), which only allows fuel to flow out; a one-way pressure relief valve (9), which only allows fuel to flow in; a connector (11), which has a housing (13) on the inside; and a valve disc (14), which engages the housing (13) of the connector (11) and has a plurality of through outlet holes (18) and a through relief hole (20). A shutter of the outlet closing valve (8) consists of a flexible sheet (22), which is fixed to the valve disc (14) and has: a plurality of shutting portions (23) arranged in the area of the outlet holes (18); a peripheral mounting portion (25) with an annular shape; a plurality of outer connection portions (26), each connecting the peripheral mounting portion (25) to a corresponding shutting portion (23); a central mounting portion (24); and a plurality of inner connection portions (27), each connecting the central mounting portion (24) to a corresponding shutting portion (23).
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公开(公告)号：EP4242447A1
公开(公告)日：2023-09-13
申请号：EP23161166.6
申请日：2023-03-10
发明人： SPIZZIRRI, Armando , MARIANELLO, Riccardo , MANCINI, Luca , PETRECCHIA, Stefano , PETRONE, Michele , PASQUALI, Paolo
摘要： A valve assembly (7) for a fuel pump (1) and having: a one-way outlet closing valve (8), which only allows fuel to flow out; a one-way pressure relief valve (9), which only allows fuel to flow in; a connector (11), which has a housing (13) on the inside; a valve disc (14), which engages the housing (13) of the connector (11) and has a plurality of through outlet holes (18) and a through relief hole (20); an annular body (33) which is arranged in the housing (13) of the connector (11) and has a central through hole (34); a spring (30), which is part of the pressure relief valve (9), is arranged in the central hole (34) of the annular body (33) and pushes a shutter (29) of the pressure relief valve (9); and a connection element (31) interposed between the shutter (29) of the pressure relief valve (9) and the spring (30). The central hole (34) of the annular body (33) has an annular protuberance (40) which constitutes a limit stop that limits the travel of the connection element (31).
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