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Method for monitoring a passive pressure regulating valve

A pressure and rail pressure technology used in the field of monitoring passive pressure regulating valves

Active Publication Date: 2016-08-17
ROLLS ROYCE SOLUTIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this occurs in practice due to leakage of the pressure limiting valve, which is still detected by the evaluation program as open, but in fact it is still closed

Method used

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  • Method for monitoring a passive pressure regulating valve
  • Method for monitoring a passive pressure regulating valve
  • Method for monitoring a passive pressure regulating valve

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Experimental program
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Embodiment Construction

[0016] figure 1 A system diagram of an electronically controlled internal combustion engine 1 with a common rail system is shown. The common rail system comprises the following mechanical components: a low-pressure pump 3 for delivering fuel from the fuel tank 2, a variable suction throttle valve 4 for influencing the fuel volume flow passing through, a A high-pressure pump 5 for delivering fuel, a fuel rail 6 for storing fuel, and injectors 7 for injecting fuel into a combustion chamber of internal combustion engine 1 . Alternatively, the common rail system can also be embodied with a single accumulator, wherein then, for example, the individual accumulator 8 is integrated in the injector 7 as an additional buffer volume. As protection against impermissibly high pressure levels in the fuel rail 6, a passive pressure limiting valve 11 is provided, which opens, for example, at a rail pressure of 2400 bar and, in the open state, diverts fuel from the oil The rail 6 returns to ...

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Abstract

A method is proposed for monitoring a passive pressure limiting valve (11) via which fuel is discharged from a fuel rail (6) of a common rail system into a fuel tank (2), wherein, after detection of a In the case of a defective rail pressure sensor (9) change from rail pressure regulation operation to emergency operation, wherein in emergency operation the rail pressure is gradually increased until the pressure limiting valve (11) reacts, wherein in emergency operation During operation, if the start-up phase of the internal combustion engine is additionally detected to be complete, the pressure limiting valve ( 11 ) is set to open, and the duration of the opening of the pressure limiting valve ( 11 ) is additionally monitored.

Description

technical field [0001] The invention relates to a method for monitoring a passive pressure limiting valve via which fuel is led from a rail of a common rail system into a fuel tank, wherein, after defective fuel is detected In the case of a rail pressure sensor, there is a change from rail pressure regulating operation (Raildruck-Regelungsbetrieb) to emergency operation (Notbetrieb), wherein in emergency operation the rail pressure is gradually increased until the pressure limiting valve reacts. Background technique [0002] In the method known from DE 10 2006 049 266 B3, the opening of a passive pressure limiting valve is monitored. After unloading, an open pressure limiting valve is thus detected, i.e. the rail pressure exceeds a limit value, and then a stable state of the internal combustion engine is detected, and additionally, the characteristic parameters of the rail pressure control circuit are related to the reference value Significant deviation. The characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/22F02D41/38
CPCF02D41/221F02D41/3863F02D41/22F02D41/38F02D41/222
Inventor A.德尔克
Owner ROLLS ROYCE SOLUTIONS GMBH