Method of accurately metering a gaseous fuel that is injected directly into a combustion chamber of an internal combustion engine

A technology of gas fuel and combustion chamber, which is applied in the direction of bringing fuel into the engine, liquid fuel feeder, gaseous engine fuel, etc. through high-pressure gas, and can solve problems such as operational impact

Inactive Publication Date: 2009-04-01
WESTPORT POWER
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Problems solved by technology

Therefore, while fuel injection pressure can become a more important factor in affecting gaseous fuel mass flow rate, injector operation can also be affected by in-cylinder pressure when fuel flow is unchoked

Method used

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  • Method of accurately metering a gaseous fuel that is injected directly into a combustion chamber of an internal combustion engine
  • Method of accurately metering a gaseous fuel that is injected directly into a combustion chamber of an internal combustion engine
  • Method of accurately metering a gaseous fuel that is injected directly into a combustion chamber of an internal combustion engine

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Embodiment Construction

[0029] The pressure difference across the fuel injection valves depends on the injection pressure and the pressure in the cylinder. In a common rail fuel injection system, the injection pressure of the gaseous fuel is the pressure of the fuel in the fuel rail, whereas in some engines the fuel injection pressure is variable as a function of engine operating conditions. In-cylinder pressure is the instantaneous pressure in the combustion chamber when fuel is being injected into the combustion chamber. In-cylinder pressure depends on several factors. For example, the mass charge (mass charge) being compressed in the cylinder, the temperature of the charge, the volumetric efficiency of the engine at the current engine speed, the bore and stroke of the engine, and the amount of exhaust gas currently being recirculated - if the engine uses In the case of exhaust gas recirculation, where the charge itself depends on the intake manifold air pressure. Since the in-cylinder pressure v...

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Abstract

For gaseous fuels that are injected directly into a combustion chamber the mass flow rate through an injection valve can be influenced by changes in the in-cylinder pressure. A method and apparatus are provided for accurately metering a gaseous into a combustion chamber of an internal combustion engine. The method comprises inputting a fueling command; determining from said fueling command a baseline pulse width of an injection event, based upon a baseline pressure differential across a fuel injection valve; estimating the difference between said baseline pressure differential and an actual pressure differential; calculating a corrected pulse width by applying at least one correction factor to said baseline pulse width, wherein said correction factor is a function of the estimated difference between said baseline pressure differential and said actual pressure differential.

Description

technical field [0001] The invention relates to a method for the precise metering of gaseous fuel injected directly into the combustion chamber of an internal combustion engine. More specifically, the present invention relates to compensating for pressure differentials between in-cylinder pressure and fuel supply pressure by adjusting fuel injection pulse width to accurately meter a desired amount of fuel into the engine. Background technique [0002] Engines burning diesel fuel are the most common type of compression ignition engines. So-called diesel engines introduce liquid fuel under high pressure directly into the combustion chamber. Diesel engines are very efficient as this allows high compression ratios without the risk of knocking, which is the premature detonation of the fuel mixture in the combustion chamber. Because a diesel engine introduces its fuel directly into the combustion chamber, the fuel injection pressure must be greater than the pressure within the c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M69/52F02M67/06F02M67/14F02M69/16F02B43/00G01F11/28
CPCF02D41/187F02D35/023F02D2200/0406F02D2200/0602F02D19/027Y02T10/32F02M21/0275F02D2200/0604F02D41/0027F02D19/024F02D2041/389F02D2041/2027F02D35/024Y02T10/30
Inventor G·贝特博格R·J·安赛姆M·E·邓恩D·戈迭
Owner WESTPORT POWER
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