Abstract:
The method for controlling the operation of an internal combustion engine comprises at least two operating modes.In a first operating mode,the intake valve (3) is closed at a first predetermined crank angle, in accordance with the Miller cycle, before the piston (2) reaches bottom dead center during the intake stroke for reducing pressure in the cylinder (1), and fuel is injected using first fuel injection means (9a) optimized for large amounts of fuel. In a second operating mode the intake valve (3) is closed at a second predetermined crank angle, in accordance with conventional intake valve closing timing, after or slightly before the piston (2) has passed bottom dead center, and fuel is injected using second fuel injection means (9b) optimized for small amounts of fuel. The invention also concerns an internal combustion engine.
Abstract:
The common rail fuel injection system for a piston engine (1) comprises a fuel rail (9), at least one fuel injector (3) connected to the fuel rail (9), a first fluid receiver (6), a second fluid receiver (7), at least one low-pressure pump (5) for supplying fuel into the first fluid receiver (6), at least one high-pressure pump (10) for receiving fuel from the second fluid receiver (7) and for supplying the fuel into the fuel rail (9), and at least two flow control valves (8a, 8b, 8c) connected in parallel. Each of the flow control valves (8a, 8b, 8c) is individually controllable and connected to the first fluid receiver (6) on the upstream side and to the second fluid receiver (7) on the downstream side.
Abstract:
The connecting element (10) for connecting a fuel injector (3) of a piston engine (1) to a fuel rail (4) comprises a connecting block (11) for receiving fuel from a fuel rail (4), and a fuel pipe (12) that is attached to the connecting block (11) for supplying fuel to a fuel injector (3), the connecting block (11) being provided with a fuel inlet (13) for receiving fuel from the fuel rail (4) and with a fuel outlet (14) that is connected to the fuel pipe (12). The fuel pipe (12) is provided with a flow fuse (15) for preventing fuel supply to a leaking fuel injector (3).
Abstract:
The fuel injection arrangement for injecting liquid fuel into a cylinder (11) of a piston engine comprises a first fuel injection valve (1), a second fuel injection valve (2) and a pressure medium source (3) for supplying fuel to the fuel injection valves (1, 2). A selector valve (4) is used for choosing which one of the fuel injection valves (1, 2) is used. A first fuel duct (6) connects the first fuel injection valve (1) to the selector valve (4), and a second fuel duct (7) connects the second fuel injection valve (2) to the selector valve (4). The arrangement comprises means (8) for regulating pressure in the second fuel duct (7) between the selector valve (4) and the second fuel injection valve (2).
Abstract:
A fuel injection system (1) for a reciprocating engine, comprising injectors (6) for injecting pressurized fuel into the cylinders (13) of the engine, a high pressure pump (5) for pressurizing fuel to be injected, a supply pipe (7) for feeding fuel from the high pressure pump (5) toward the injectors (6)and feed pipes (8) for feeding fuel from the supply pipe (7) to the injectors (6). The first ends of the feed pipes (7) are connected to the injectors(6) and the second ends to the supply pipe (7). Each fuel injector (6) is provided with a pressure accumulator (14).
Abstract:
A pipe connector (24) comprising a first fitting (25) con- nectable to the first double wall pipe, the first fitting (25) comprising a first portion (45) connectable to the inner flow space and a second portion (46) connectable to the outer flow space of the first double wall pipe, a second fitting (26) connectable to the inner flow space of the second double wall pipe, a third fitting (27) and a leak channel (31) arranged in flow connection with the second portion (46) of the first fitting. The pipe connector is provided with a clo- sure member (34) having a first position, in which flow of fluid from the leak channel (31) to the leakage outlet (32) is prevented, and a second position, in which flow of fluid from the leak channel (31) to the leakage outlet (32) is al- lowed, which closure member (34) is arranged to move from the first position to the second position when fluid pressure in the leak channel (31) rises above a certain lim- it. The pipe connector is also provided with a blocking means (28) for preventing flow of fluid from the outer flow space of the second double wall pipe from passing through the pipe connector (24).
Abstract:
A fuel injection system (1) comprising two injection valves (4, 5) for each cylinder, a switch valve (12) and a control valve (19). The switch valve (12) has a first position, where flow communication between the control valve (19) and the first fuel injection valve (4) is open and flow communication between the control valve (19) and the second fuel injection valve (5) is closed, and a second position, where flow communication between the control valve (19) and the second fuel injection valve (5) is open and flow communication between the control valve (19) and the first fuel injection valve (4) is closed. The control valve (19) has a first position, where flow communication between the pressure accumulator (6) and the switch valve (12) is open and flow communication between a drain line (20) and the switch valve (12) is closed, and a second position, where flow communication between the drain line (20) and the switch valve (12) is open and flow communication be- tween the pressure accumulator (6) and the switch valve (12) is closed.
Abstract:
The fuel injection unit (1) for an internal combustion engine comprises a body (29), a first fuel gallery (31) and a second fuel gallery (32), a first fuel injection nozzle (3) and a second fuel injection nozzle (4), a first injector needle (7) for opening and closing flow communication between the first fuel gallery (31) and the first fuel injection nozzle (3), and a second injector needle (8) for opening and closing flow communication between the second fuel gallery (32) and the second fuel injection nozzle (4). The invention also concerns a fuel injection system.