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Method for determining injection start time and injection quantity of fuel

A technology of injection start and fuel injection, applied in fuel injection control, combustion engine, internal combustion piston engine, etc., can solve problems such as complex methods, inaccuracies, and errors

Active Publication Date: 2021-07-06
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, the method is highly complex, error-prone and inaccurate due to the long chain of functions

Method used

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  • Method for determining injection start time and injection quantity of fuel
  • Method for determining injection start time and injection quantity of fuel

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Embodiment Construction

[0029] The invention is based on the insight that, on the assumption of intake-synchronized fuel injection, there is a unique relationship between the distribution of the intake manifold pressure oscillation signal and the injection start time and also the injection quantity of the fuel in the intake tract of an internal combustion engine.

[0030] In the method according to the invention, during normal operation, during intake-synchronized fuel injection, first at defined operating points, the cylinders assignable to the internal combustion engine in the inlet tract of the respective internal combustion engine are measured The dynamic pressure oscillation, and thus generate the corresponding pressure oscillation signal. At the same time, a crankshaft phase angle signal of the internal combustion engine is determined, so to speak, as a reference signal.

[0031] One possible operating point would be eg idle operation at a predetermined rotational speed. Here, intake-synchroni...

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Abstract

In the method according to the invention, during normal operation, during intake-synchronized fuel injection, at defined operating points, dynamic pressure oscillations in the inlet port of the respective internal combustion engine assignable to the cylinders of the internal combustion engine are measured, and From this a pressure oscillation signal is determined relative to the synchronously measured crankshaft phase angle signal. The injection signal component resulting from fuel injection is calculated by subtracting the reference base pressure oscillation signal from the pressure oscillation signal, and its signal phase position and signal amplitude relative to the crankshaft phase angle signal are determined. Subsequently, the injection start time is determined based on the determined signal phase position of the injection signal component, taking into account the reference phase position, and the injection quantity is determined based on the determined signal amplitude of the injection signal component, taking into account the reference amplitude.

Description

technical field [0001] The invention relates to a method for determining the injection start time and injection quantity of fuel of an internal combustion engine from an intake manifold pressure signal during normal operation of the internal combustion engine. Background technique [0002] In this context and hereinafter, reciprocating piston internal combustion engines will also be referred to in shortened form only as internal combustion engines, which have one or more cylinders, in each case a reciprocating piston arranged in one or more in multiple cylinders. In order to illustrate the principle of reciprocating piston internal combustion engine, the following will be figure 1 make a reference, figure 1 The cylinders and the most important functional units of an internal combustion engine, which may also be a multi-cylinder internal combustion engine, are illustrated by way of example. [0003] The corresponding reciprocating piston 6 is arranged in a linearly movable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/34F02D41/24
CPCF02D41/2422F02D2200/021F02D2200/0414F02D2200/0616F02D2200/0618F02D2200/101F02D41/34Y02T10/40
Inventor T.布劳恩J.凯因茨
Owner VTESCO TECH GMBH
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