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Method for determining speed

A technology of rotational speed and reference rotational 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 simplifying operations and saving costs

Active Publication Date: 2014-11-26
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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  • Method for determining speed
  • Method for determining speed

Examples

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Embodiment Construction

[0046] figure 1 Shown is a schematic flow diagram of the method according to the invention for determining the rotational speed.

[0047] A signal (step 1 ) received by a sensor (not shown), designed for example as an airborne-acoustic, structure-borne-acoustic or optical sensor, is amplified (step 2 ) and converted into a digital signal by an analog-to-digital converter (step 4 ). If necessary, the analog-to-digital converter includes an anti-aliasing filter, as is known from the prior art. A bandpass filter can also be provided to minimize noise on the received signal.

[0048] When the method is started, that is to say when the rotational speed is determined for the first time, the rotational speed starting value is obtained from the digital signal by a known algorithm for frequency analysis, such as FFT or Kepstrum analysis (step 6), This value is used as the reference speed. In this case, the reference rotational speed is tolerant of errors, since it is only used as a ...

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PUM

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Abstract

The method involves providing a reference signal, which corresponds to a known reference speed of the machine. A reference area of the reference signal is separated, where the reference area corresponds to one or multiple revolutions of the machine. A measuring signal is received. The machine is rotated with an unknown speed. A measuring area is separated from the measuring signal. The correlation between the reference area and the measuring area is determined. The hypothetical speed is determined. An independent claim is also included for a device for speed determination.

Description

technical field [0001] The invention relates to a method for determining a rotational speed and a device for carrying out the method. Background technique [0002] Various methods of determining the rotational speed of a rotary motion are known. 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 methods for rotating internal combustion engines in which the rotational speed of the machine is derived from electrical or mechanical parameters . However, these methods are not universally applicable to all rotating machines like electric motors for example. In addition, due to the poor accessibility in the case of internal combustion engines, for example when the internal combustion engine is operated with rod-shaped ignition coils, expensive adaptation work is often required or adaptation is even excluded altogether. [0003] Methods for determining the rotational speed based on structure-borne or airborne sound are known, for example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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