Method for determining a rotational speed

A technology of rotational speed and crankshaft rotational speed, which is applied to devices using electric/magnetic methods, devices for measuring the time required to move a certain distance, starting of engines, etc., can solve problems such as inability to achieve high-resolution rotational speed determination, and achieve The effect of saving cost and improving resolution

Active Publication Date: 2015-10-14
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

High-resolution speed determination is thus not possible

Method used

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  • Method for determining a rotational speed
  • Method for determining a rotational speed
  • Method for determining a rotational speed

Examples

Experimental program
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Embodiment Construction

[0035] exist figure 1 In the middle, the sensor wheel 20 and the associated inductive sensor 10 are shown, which are used in the prior art to determine the rotational speed. In this case, the sensor wheel 20 is fixedly connected to the crankshaft of the internal combustion engine and the sensor 10 is fixedly mounted at a suitable location.

[0036] The sensor wheel 20 , usually made of ferromagnetic material, has teeth 22 which are arranged on the outer side at a distance 21 between two teeth 22 . At one point on the outer side, the sensor wheel 20 has a tooth gap 23 over the length of a given number of teeth. This tooth gap 23 serves as a reference mark for identifying the absolute position of the sensor wheel 20 .

[0037] The sensor 10 has a rod magnet 11 on which a magnetically soft pole pin 12 is mounted. The pole pin 12 is in turn surrounded by an induction coil 13 . When the sensor wheel 20 rotates, the teeth 22 and the space between two teeth alternately pass by th...

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PUM

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Abstract

The invention relates to a method for determining a rotational speed of a crankshaft of an internal combustion engine, which with an electric machine comprising a rotor and a stator, is coupled directly or translated, where one or more signals (UU, UV, UW) of the electrical machine are each a or have multiple values (WU, WV, WW), each occurring at least once per revolution of the rotor; and wherein by calculating a time difference ([increment] T1, [increment] t2, [increment] t3) calculates the rotational speed between two times of occurrence of values and is used to control the internal combustion engine.

Description

technical field [0001] The invention relates to a method for determining the rotational speed of a crankshaft of an internal combustion engine by evaluating at least one signal of an electric machine. Background technique [0002] The rotational speed of the crankshaft of the internal combustion engine is an important input variable for many functions of the electronic engine controller. To achieve this, markings at the same angular distance as the crankshaft of the internal combustion engine can be provided. The sweeping of the marking due to the rotation of the crankshaft can be detected by a sensor and transmitted as an electrical signal to the evaluation circuit. [0003] This circuit measures the time difference between the two markers and can calculate the angular velocity from the known angular distance of the two markers. For cars or motorcycles / mopeds, for example, markings can be provided by the teeth of metal gears, so-called sensor wheels, which cause a change ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/02F02D41/26G01P3/66
CPCF02D41/02G01P3/46F02D41/0097F02N11/04G01P3/487
Inventor S.格罗德W.菲舍尔B.赖内克C.斯坦布雷赫尔
Owner ROBERT BOSCH GMBH
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