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Method for determining speed

A technology of rotating speed and reference rotating speed, which is applied to devices using electric/magnetic methods, devices that measure the time required to move a certain distance, etc., can solve problems such as failure, and achieve the effect of simplified operation and cost saving.

Active Publication Date: 2011-05-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods partially achieve good results at stable rotational speeds, but fail with rapidly changing rotational speeds during highly dynamic processes, as they occur, for example, when the internal combustion engine is free-starting from the no-load to full-load range.

Method used

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Examples

Experimental program
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Embodiment Construction

[0046] figure 1 Shown is a schematic flowchart of a method for determining a rotation speed according to the present invention.

[0047] A signal (step 1) received by an unillustrated sensor, such as an airborne sound, structure-borne sound, or optical sensor, is amplified (step 2) and converted into a digital signal by an analog-to-digital converter (step 4). When required, the analog-to-digital converter includes an anti-aliasing filter, as is known in the prior art. It is also possible to set a band pass filter to minimize the noise of the received signal.

[0048] When the method is started, that is, when the rotation speed is determined for the first time, the digital signal passes through a well-known algorithm for frequency analysis, such as FFT or Kepstrum analysis, to obtain the rotation speed start value (step 6), This value is used as the reference speed. In this case, the reference speed is allowed to have errors, because it is only used as a starting point for the pr...

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PUM

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Abstract

The invention relates to a method for determining speed. The method comprises the following steps of providing a reference signal which is equal to or at least similar to the widely-known machine reference rotating speed; dividing a reference range from the reference signal, with the reference range being equal to one or multiple rotations of a machine; receiving a measuring signal when the machine rotates with a unknown speed to be determined; diving a measuring range from the measuring signal, with the measuring range being not equal to the reference range and being received as a reference range at future time point; determining the correlation between the reference range and the measuring range for multiple times, and receiving several different rotating speeds that are hypothesized; determining the hypothetical rotating speed, with which the correlation between the reference range and the measuring range is the largest.

Description

Technical field [0001] The invention relates to a method for determining the rotational speed and a device for implementing the method. Background technique [0002] Various methods for determining the rotational speed of a rotating motion are known. For example, from DE 35 05 440 A1, US 4 173 896, EP 0 315 357 A1 and EP 0 408 877 A1 are known methods for rotating internal combustion engines, in which the speed of the machine is obtained from electrical or mechanical parameters . However, these methods are not universally applicable to all rotating machines such as electric motors. In addition, due to poor accessibility in the internal combustion engine, for example, when the internal combustion engine is operated with a rod-shaped ignition coil, it often requires expensive adaptation work or even completely eliminates the adaptation. [0003] Methods for determining the rotational speed based on structure-borne sound or airborne sound are known, for example, from DE 44 40 999, ...

Claims

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Application Information

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IPC IPC(8): G01P3/80
CPCG01P3/44G01P3/48G01P3/80
Inventor K·斯滕格尔G·哈加G·B·比达尔R·西格M·舒曼
Owner ROBERT BOSCH GMBH