Method for operating an injection system of an internal combustion engine

A technology of injection system and internal combustion engine, applied in the direction of fuel injection control, internal combustion piston engine, combustion engine, etc., can solve the problems of strong deviation of fuel supply, impossibility to accurately achieve fuel injection rate, high sensitivity, and achieve rapid control. Effect

Inactive Publication Date: 2011-08-10
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0015] However, the position assumed by the injector needle in this case depends on many factors, including all mechanical forces acting on the injector needle itself, manufacturing tolerances, and fuel temperature, so it is practically impossible to achieve exactly the desired fuel injection rate
[0016] Moreover, the sensitivity of the total fuel delivery to the time difference between two injection events has been found to be very high, so small deviations in the mechanical and / or electrical performance of the injectors often lead to strong deviations in the fuel delivery
[0017] Therefore, the resulting injection rate shaping is usually unreliable

Method used

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  • Method for operating an injection system of an internal combustion engine
  • Method for operating an injection system of an internal combustion engine
  • Method for operating an injection system of an internal combustion engine

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Embodiment Construction

[0052] One embodiment of the present invention provides a method for operating a direct injection system of a diesel engine of an automobile, wherein the direct injection system includes one electrically controlled solenoid for each engine cylinder.

[0053] Since the operating method described works equally well for each engine cylinder, this exemplary embodiment is explained below with respect to individual engine cylinders.

[0054] During engine operation, a number of engine cycles occur consecutively within a cylinder, each engine cycle including a fuel injection phase spanning a compression stroke and an expansion stroke.

[0055] The fuel injection phase is carried out by the solenoid injector in a multi-injection mode, which is usually used to perform several different injection processes within the same injection phase.

[0056] In this example (see figure 1 with 3 ), the multi-injection mode only includes two consecutive injection processes, namely the pilot inject...

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Abstract

A method is provided for operating a direct injection system of an internal combustion engine of a motor vehicle. The at least one fuel injection parameter (ETP, ETM and DW) is adjusted by a closed loop control of the injected fuel quantity (Q).

Description

technical field [0001] The invention relates to a method for operating a direct injection system of a motor vehicle internal combustion engine, in particular a diesel engine. The present invention relates primarily to direct injection systems with solenoid injectors. Background technique [0002] It is known that diesel engines are generally equipped with a direct injection system comprising a plurality of electrically controlled fuel injectors for injecting fuel directly into the cylinders. [0003] Fuel is typically injected into each cylinder according to a multiple injection pattern having multiple injection events per engine cycle, including at least one pilot injection and one main injection. [0004] The traditional fuel injection system is designed to activate each fuel injector as an on-off valve, so the fuel injection rate in each injection process is basically constant, and the amount of injected fuel in each process mainly depends on the injector The opening pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D41/14
CPCF02D41/401F02D2200/0614F02D2041/1433Y02T10/44F02D41/403Y02T10/40F02D41/14F02D41/34F02D41/40
Inventor 费德里科·G·鲁伊吉乔万尼·阿沃里奥
Owner GM GLOBAL TECH OPERATIONS LLC
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