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Method for determining the amount of fuel injected into an engine, in particular a diesel engine

A technology for determining the method and fuel quantity, applied in the direction of engine components, combustion engines, engine control, etc., can solve the problem of not considering heat loss, etc.

Active Publication Date: 2015-08-12
VTESCO TECH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These models do not take heat loss into account

Method used

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  • Method for determining the amount of fuel injected into an engine, in particular a diesel engine
  • Method for determining the amount of fuel injected into an engine, in particular a diesel engine
  • Method for determining the amount of fuel injected into an engine, in particular a diesel engine

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Embodiment Construction

[0060] The method illustrated in the single figure allows to determine the cumulative mass of fuel injected into the cylinders of the internal combustion engine. The invention relates more particularly to engines ignited by compression, also known as diesel engines. In this type of engine, the cylinders are arranged in the engine block and closed by the cylinder head. A piston is movable in each cylinder and defines a variable volume combustion chamber with the cylinder head and cylinder walls of the corresponding cylinder. A piston that performs a translational motion in its cylinder is connected to a crankshaft that is propelled by a rotational motion. The following will be based on such an engine operating on a four-stroke cycle known to those skilled in the art. Thus, to carry out a complete cycle in the cylinders, the crankshaft makes two revolutions, ie 720°.

[0061] For carrying out the invention it is expedient if at least one cylinder is equipped with a pressure s...

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Abstract

The invention relates to a method for determining a mass of fuel injected into a cylinder of an internal combustion engine provided with a pressure sensor, said method comprising the following steps: determining the corresponding temperature prevailing in the cylinder and the amount heat released from the measured pressure; integrating amounts of heat released over a predetermined time interval in order to determine a cumulative amount of heat; estimating losses of heat by taking into account the losses of heat which are due to radiation and which are dependent on the measured temperature to the fourth power, and losses of heat which are due to conduction and / or convection and dependent on both the measured temperature and the corresponding engine speed, according to the formula: QP = α HRCUM,where QP is the amount of heat corresponding to the losses of heat, HRCUM is said cumulative amount of heat, α is a corrective factor of the cumulative amount of heat; and determining the amount of fuel injected, which is proportional to the cumulative amount of heat added to the losses of heat.

Description

technical field [0001] The invention relates to a method for determining the quantity of fuel injected into an engine, especially a diesel engine. Background technique [0002] In diesel-type engines, air is compressed in a combustion chamber and fuel is injected under pressure into the chamber. The temperature and pressure conditions in the combustion chamber then allow the fuel to burn during injection. [0003] In order to better control the engine but also limit the emission of pollutants, it is desirable to better control the conditions under which the fuel is combusted in the combustion chamber. Regarding fuel injection, it is preferable not to inject the amount of fuel necessary for combustion in a single injection, but to perform a first injection called "pilot injection", followed by a second injection or "main injection". During pilot injection, a small amount of fuel is injected in one injection or in several consecutive "micro-injections". This fuel combustion...

Claims

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Application Information

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IPC IPC(8): F02D35/02F02D41/24
CPCF02D35/023F02D41/2467F02D35/026Y02T10/16F02D2200/0616Y02T10/12F02M65/001F02D41/30
Inventor B.瓦罗基C.朱弗内勒
Owner VTESCO TECH GMBH