Device for measuring angle and angular velocity or distance and speed

Patent metadata

Field	Value
Publication number	US-9482687-B2
Application number	US-201214130587-A
Country	US
Kind code	B2
Filing date	Jun 26, 2012
Priority date	Jul 6, 2011
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A device for measuring angle and angular velocity or distance and speed of a moving part is described. The device has a sensor which is or can be arranged in a stationary manner and an encoder which is or can be arranged on the moving part and, together with the sensor, generates a modulation signal to be demodulated by the sensor. For the frequency measurement which is needed to measure the angular velocity/speed, the encoder has a structure which reproduces a periodic pattern and is interrupted by at least one index area for the angle/distance measurement. In the index area, the encoder has a substitute pattern which differs from the periodic pattern by at least one physical variable which can be detected by the sensor but has a structure which also enables the frequency measurement in the index area.

First claim

The invention claimed is:

1. A device for measuring angle and angular velocity or distance and speed of a moving part using phase modulation, comprising:
a sensor which is or can be arranged in a stationary manner; and
an encoder, which is or can be arranged on the moving part and together with the sensor generates a modulation signal to be demodulated by the sensor,
wherein, for the frequency measurement necessary for the angular velocity/speed measurement, the encoder has a tooth structure which replicates a periodic pattern and is interrupted by at least one index region for the angle/distance measurement, wherein in the index region, the encoder has a substitute structure which differs from the structure which replicates the periodic pattern by a phase shift in the teeth that can be registered by the sensor, but also permits the frequency measurement in the index region.

2. The device as claimed in claim 1 , wherein the sensor and the encoder are formed in such a way that a modulated signal is generated with a carrier frequency and two different “messages” modulated on for the index region and the remaining region of the encoder.

3. The device as claimed in claim 2 , wherein the sensor is formed in terms of circuit technology in such a way that it extracts the carrier frequency and demodulates the transmitted “message”.

4. The device as claimed in claim 1 , wherein the periodic pattern is also present continuously in the index region.

5. The device as claimed in claim 1 , wherein the device is formed as a rotational speed measurement device.

6. The device as claimed in claim 1 , wherein the encoder is formed as a permanent magnetic encoder.

Assignees

• Acker Heinrich
• Continental Teves Ag & Co Ohg

Inventors

• Acker Heinrich

Classifications

• G01P3/481 Primary

  of pulse signals · CPC title

• G01P3/48 Primary

  by measuring frequency of generated current or voltage {(in general G01R23/00)} · CPC title

• G01P3/486

  delivered by photo-electric detectors · CPC title

• G01P3/488

  delivered by variable reluctance detectors · CPC title

• G01P3/487

  delivered by rotating magnets · CPC title