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Control and regulation method for an internal combustion engine having a common rail system

A technology of common rail system and adjustment method, which is applied in engine control, fuel injection control, electrical control, etc., and can solve problems such as frequency tracking that cannot be reflected

Active Publication Date: 2011-11-16
ROLLS ROYCE SOLUTIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, frequency tracking (in the sense of a frequency increase with a subsequent frequency decrease) is technically not possible due to the high pressure gradient in the unloaded situation.

Method used

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  • Control and regulation method for an internal combustion engine having a common rail system
  • Control and regulation method for an internal combustion engine having a common rail system
  • Control and regulation method for an internal combustion engine having a common rail system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0017] 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 as mechanical components a low-pressure pump 3 for delivering fuel from a tank 2 , a suction throttle 4 for influencing the volume flow, a high-pressure pump 5 , a rail 6 and a combustion engine for injecting fuel into an internal combustion engine 1 Injector 8 in the chamber.

[0018] The internal combustion engine 1 is controlled by an electronic motor controller 9 (ECU). exist figure 1 In , the rail pressure pCR (which is detected by the pressure sensor 7 ), the motor speed nMOT and the quantity EIN are schematically shown as input variables for the electronic motor controller 9 . The quantity EIN represents a further input signal, for example an input signal of oil temperature or fuel temperature. The shown output variables of the electronic motor controller 9 are the PWM signal PWM for actuating the intake t...

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PUM

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Abstract

The invention relates to a control and regulation method for an internal combustion engine having a common rail system, wherein a rail pressure is regulated in normal operation in that a first actual rail pressure is determined via a first filter from the rail pressure, an offset is calculated from a target rail pressure and the first actual rail pressure, a variable is calculated via a pressure regulator from the offset and a PWM signal having a first PWM frequency (f1) for activation of a control process is determined in dependence on the variable. A second actual rail pressure (pCR2(IST) is determined via a second filter, a load rejection is recognized if the second actual rail pressure (pCR2(IST)) exceeds a first threshold value (GW1), upon exceeding the first threshold value (GW1) the PWM signal switches over from the first PWM frequency (f1) to a second PWM frequency (f2) and the rail pressure is controlled upon exceeding a second threshold value in that the PWM signal is temporarily set to a PWM value that is higher than that of normal operation.

Description

technical field [0001] The invention relates to a control and regulation method for an internal combustion engine with a common rail system, in which the rail pressure is regulated in normal operation and in the event of detection of an unloading (Lastabwurf) switching from regulation operation to control operation, wherein The PWM signal used to act as an adjustment object in the control operation is temporarily set to a PWM value that is raised relative to normal operation. Background technique [0002] In a common rail system, a high-pressure pump delivers fuel from the tank to the rail. The inlet cross-section to the high-pressure pump is determined by a variable suction throttle. An injector is coupled to the rail, through which fuel is injected into the combustion chamber of the internal combustion engine. Since the quality of the combustion depends decisively on the pressure level in the rail, the pressure level is adjusted. The high-pressure regulating circuit con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/38
CPCF02D41/3845F02D2041/1432F02D2200/0602F02M59/366F02D2041/2027F02D41/20F02D2250/31
Inventor A·德尔克
Owner ROLLS ROYCE SOLUTIONS GMBH