摘要:
Disclosed is a fuel injector for internal combustion engines, in which a cross section (21) of an outlet is unblocked to establish a connection between injection pumps (1) and an injection nozzle (2) at the beginning of the pressure reduction process introducing the end of the injection phase such that the compressed fuel volume can be discharged quickly, thus allowing the pressure to be reduced rapidly.
摘要:
The invention relates to a fuel injection device for injecting fuel into the combustion chamber of an internal combustion engine. The fuel injection device comprises a fuel pump (1) which is used to pump fuel placed under increasing and decreasing pressure, in addition to an injector (5) having an injector nozzle and an injector needle (12) in order to control the beginning and end of injection. The injector needle (12) is maintained during the injection intervals in a position in which it rests on a valve seat by means of a force acting on the injector needle (12) in the direction of closure. The injector needle (12) can be impinged upon by the pressure of the fuel pumped by the fuel pump (1) in order to produce a force acting in the direction of opening on a ring surface. Injection begins if the force directed in the direction of opening exceeds the force directed in the direction of closure, whereby the force directed in the direction of closure is variably adjusted prior to the beginning of injection according to engine operation parameters.
摘要:
Disclosed is a fuel injector for internal combustion engines, in which a cross section (21) of an outlet is unblocked to establish a connection between injection pumps (1) and an injection nozzle (2) at the beginning of the pressure reduction process introducing the end of the injection phase such that the compressed fuel volume can be discharged quickly, thus allowing the pressure to be reduced rapidly.
摘要:
The invention relates to a fuel injection device comprising a fuel pump embodied as a double piston pump which is used to pump fuel into the combustion chamber of an internal combustion engine to an injector respectively associated therewith and which is optimized with regard to the injection process thereof. The double piston pump comprises two pistons (70, 73) which pump in parallel along a common line and which are provided with control edges. A control rod (71,74) is associated with each piston (70,73) and is used to control the beginning and end of the pumping. The beginning of the pumping can be adjusted on the first piston (70) and the end of the pumping can be adjusted on the second piston (73). A control pressure is provided prior to the beginning of injection according to engine operation parameters in order to adjust the force acting upon the injector needle (12) in the direction of closure, said pressure enabling pressure to be impinged upon the valve needle (12) in the direction of closure. In order to compensate an alteration in the beginning of injection caused thereby, the control rod (71) of the first piston (70) regulating the beginning of pumping is adjusted accordingly.
摘要:
On the housing side, a high-pressure injector (1) has a central receptacle chamber (16) which lies between the actuator and the control valve (17) and is penetrated centrally by a control rod (23) which is multiple times as long as it is thick, and which receptacle chamber (16) forms, at least over part of its length, a pressure accumulator (24), in which the control rod (23) is surrounded directly by the fuel.
摘要:
On the housing side, a high-pressure injector (1) has a central receptacle chamber (16) which lies between the actuator and the control valve (17) and is penetrated centrally by a control rod (23) which is multiple times as long as it is thick, and which receptacle chamber (16) forms, at least over part of its length, a pressure accumulator (24), in which the control rod (23) is surrounded directly by the fuel.
摘要:
The invention relates to a fuel injection device comprising a fuel pump embodied as a double piston pump which is used to pump fuel into the combustion chamber of an internal combustion engine to an injector respectively associated therewith and which is optimized with regard to the injection process thereof. The double piston pump comprises two pistons (70, 73) which pump in parallel along a common line and which are provided with control edges. A control rod (71,74) is associated with each piston (70,73) and is used to control the beginning and end of the pumping. The beginning of the pumping can be adjusted on the first piston (70) and the end of the pumping can be adjusted on the second piston (73). A control pressure is provided prior to the beginning of injection according to engine operation parameters in order to adjust the force acting upon the injector needle (12) in the direction of closure, said pressure enabling pressure to be impinged upon the valve needle (12) in the direction of closure. In order to compensate an alteration in the beginning of injection caused thereby, the control rod (71) of the first piston (70) regulating the beginning of pumping is adjusted accordingly.