INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE HAVING SUCH AN INJECTION SYSTEM
An injection system for an internal combustion engine including at least one injector and a high-pressure accumulator, which has a fluid connection to the at least one injector on the one side and has a fluid connection to a fuel reservoir via a high-pressure pump on the other side, wherein a suction throttle is associated with the high-pressure pump as a first pressure-setting element. At least two pressure control valves are provided, via which the high-pressure accumulator can be brought into fluid connection with the fuel reservoir.
1 - 10 . (canceled)
11 . An injection system for an internal combustion engine, comprising:
at least one injector;
a high-pressure accumulator which is fluidically connected at one side to the at least one injector and at another side via a high-pressure pump to a fuel reservoir;
a suction throttle assigned to the high-pressure pump as a pressure setting element; and
at least two pressure regulating valves by which the high-pressure accumulator is fluidically connectable to the fuel reservoir.
12 . The injection system according to claim 11 , further comprising a control unit operatively connected to the suction throttle and to the at least two pressure regulating valves, wherein the injection system is configured to,
a) in a normal operating mode, regulate a high pressure in the high-pressure accumulator by actuating the suction throttle as the pressure setting element, wherein, at least one first pressure regulating valve of the at least two pressure regulating valves is actuated in order to generate a high-pressure disturbance variable;
b) in a first operation type of a protective operating mode, regulate the high pressure in the high-pressure accumulator by actuating the at least one first pressure regulating valve as pressure setting element; and
c) in a second operation type of the protective operating mode, actuate at least one second pressure regulating valve of the at least two pressure regulating valves, which differs from the at least one first pressure regulating valve, in addition to the at least one first pressure regulating valve as pressure setting element to regulate the high pressure in the high-pressure accumulator.
13 . The injection system according to claim 12 , wherein the injection system is configured to, in a third operation type of the protective operating mode, permanently open the at least one first pressure regulating valve and the at least one second pressure regulating valve.
14 . The injection system according to claim 13 , wherein the injection system is configured to
d) switch to the first operation type of the protective operating mode when the high pressure reaches or overshoots a first pressure threshold value or if a defect of the suction throttle is detected, and/or
e) switch to the second operation type of the protective operating mode when the high pressure reaches or overshoots a second pressure threshold value, and/or
f) switch to the third operation type of the protective operating mode when the high pressure reaches or overshoots a third pressure threshold value or if a defect of a high-pressure sensor is detected.
15 . The injection system according to claim 12 , wherein the injection system is configured to, in at least one operation type of the protective operating mode, actuate the suction throttle so that the suction throttle assumes a permanently open position.
16 . The injection system according to claim 11 , wherein at least one of the at least two pressure regulating valves is configured to be open when deenergized.
17 . The injection system according to claim 12 , wherein the injection system is configured to generate a first actuation signal and a second actuation signal and to actuate the at least one first pressure regulating valve and the at least one second pressure regulating valve alternately with the first actuation signal and the second actuation signal.
18 . The injection system according to claim 11 , wherein the injection system is free from a mechanical pressure relief valve.
19 . An internal combustion engine comprising an injection system according to claim 11 .
20 . The internal combustion engine according to claim 19 , wherein the internal combustion engine is a large engine.