Method for operating internal combustion engine, device for adjusting and/or controlling internal combustion engine, injection system and internal combustion engine
An injection system and internal combustion engine technology, applied in engine control, fuel injection control, machine/engine, etc., can solve problems such as damage to the high-pressure pump of the injection system, unfavorable suction throttling parts, system leakage, etc., and achieve good emission performance and the effect of speeding up performance
Active Publication Date: 2018-12-21
ROLLS ROYCE SOLUTIONS GMBH
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Problems solved by technology
[0006] While this is basically true, it turns out that there is still a related problem: In newer common rail systems, controlling the suction restriction according to the prior art is not very beneficial, because this system has only a small system leakage
Since the motor operates at a high pressure of 600 ... 2200 bar, there is generally a high pressure before the motor starts, which can damage the high pressure pump of the injection system
Method used
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[0055] figure 1 A device according to the prior art is shown. Such a device is described in DE 10 2014 213 648 B3. In this case, internal combustion engine 1 has an injection system 3 . The injection system 3 is preferably designed as a common rail injection system. The common rail injection system has a low-pressure pump 5 for delivering fuel from a fuel accumulator 7 , an adjustable low-pressure side suction throttle 9 for influencing the fuel volume flow to a high-pressure pump 11 for The fuel is delivered under increased pressure to a high pressure accumulator 13 for storing fuel and preferably a plurality of injectors 15 for injecting fuel into a combustion chamber 16 of the internal combustion engine 1 . Alternatively, it is possible for the injection system 3 to also be implemented with a separate accumulator, wherein for example a separate accumulator 17 is integrated in the injector 15 as an additional buffer volume. In the exemplary embodiment shown here, an in p...
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The invention relates to a method for operating an internal combustion engine, which comprises an engine having a number of cylinders and comprises an injection system having high-pressure components,in particular an injection system that has a common rail and that has a number of injectors associated with the cylinders, in particular wherein an individual accumulator is associated with each injector, which individual accumulator is designed to store fuel from the common rail for the injector, wherein the method has the following steps: starting the internal combustion engine, operating the internal combustion engine, shutting off the internal combustion engine. According to the invention, the following steps are provided in the method: a state indicating an engine standstill is detected,in particular after the internal combustion engine has been shut off, a high-pressure limit value is defined and a target high pressure is specified, a leakage is produced in the common rail withoutinjection, the fuel pressure in the common rail is reduced to the defined high-pressure limit value below the target high pressure by means of the leakage.
Description
technical field [0001] The invention relates to a method for operating an internal combustion engine comprising a motor with a plurality of cylinders and an injection system with high-pressure components, in particular with a common rail, with a plurality of injection systems corresponding to the cylinders In particular, one injector corresponds to a separate reservoir configured to pre-store the injector with fuel from the common rail. Background technique [0002] The concept of an injector with a separate accumulator within the scope of a common rail injection system has been demonstrated, for example, as described in DE 199 35 519 C2. A separate reservoir is supplied with pressurized fuel from a pressure fitting through a fuel supply passage and is directly fluidly connected with a high pressure passage for high pressure fuel in the common rail. The volume of the separate reservoir is large compared to the volume of the high pressure line in the injector and the nozzle ...
Claims
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IPC IPC(8): F02D41/04F02D41/06F02D41/38
CPCF02D41/042F02D41/062F02D41/3872F02D2200/0602F02D2250/31
Inventor A.德尔克
Owner ROLLS ROYCE SOLUTIONS GMBH