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Method for checking variable valve lift control of internal combustion engine

A technology of internal combustion engine and valve lift, which is applied in the direction of engine control, internal combustion piston engine, combustion engine, etc. It can solve the problems of intensive calculation and achieve the effect of low computational complexity

Active Publication Date: 2020-10-30
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this, a full Fourier transform is performed, which has the disadvantage of being very computationally intensive

Method used

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  • Method for checking variable valve lift control of internal combustion engine
  • Method for checking variable valve lift control of internal combustion engine
  • Method for checking variable valve lift control of internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0053] Figure 4 A schematic flowchart of the proposed method is shown. In step 100, a reference frequency f of the internal combustion engine is determined from the rotational speed of the internal combustion engine R . At the same time, the intake air pressure signal P in the manifold intake of the internal combustion engine is measured by means of a pressure sensor. In step 110, using the determined reference frequency f R and the intake pressure signal P, the reference amplitude Af of the intake pressure signal P is calculated using the Görtzel-algorithm known per se R .

[0054] In step 120, determine the comparison frequency f V , which constitutes the reference frequency f R Non-integer multiples of . In step 130, the intake pressure signal P is compared with the frequency f V Together they are used to calculate the intake pressure signal P at the comparison frequency f V The comparative amplitude of the oscillation under A V .

[0055] In step 140, the deter...

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Abstract

The invention relates to a method for checking a variable valve lift control of an internal combustion engine. During the operation of the internal combustion engine, the following steps are carried out: detecting the rotational speed of the internal combustion engine; measuring the intake pressure (P) in the intake tract of the internal combustion engine, wherein during a defined stationary behavior of the internal combustion engine, the following steps are carried out at discrete times: defining a reference frequency (fR) which depends on the rotational speed of the internal combustion engine; defining a comparison frequency (fV) as a non-whole number multiple of the reference frequency (fR); ascertaining amplitudes (AR) of vibrations of the intake pressure (P) in the intake tract of theinternal combustion engine on the reference frequency (fR) and ascertaining amplitudes of vibrations of the intake pressure (P) in the intake tract of the internal combustion engine on the comparisonfrequency (fV); and evaluating the ratio of the ascertained amplitudes (AR, AV) to the absolute values thereof in a defined manner.

Description

technical field [0001] The invention relates to a method for checking a variable valve lift control of an internal combustion engine. Furthermore, the invention relates to a device for checking a variable valve lift control of an internal combustion engine. The invention also relates to a computer program product. Background technique [0002] Modern internal combustion engines are often equipped with variable valve lift control systems, which have a favorable influence on various characteristic data of the internal combustion engine (eg fuel consumption, power development, emissions, etc.). In order to avoid disadvantages with regard to exhaust emissions, the change in valve lift caused by the valve lift control must occur precisely and reliably. Here, among other things, use such a system, which is actuated indirectly (for example, by means of a hydraulic actuator) and / or in said system, the electric actuator does not allow to draw conclusions about the correct performan...

Claims

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Application Information

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IPC IPC(8): F01L13/00
CPCF01L13/00F01L2800/11F02D13/0207F01L2013/118B60W50/02F01L31/00F02D41/221
Inventor S·布尔
Owner VTESCO TECH GMBH