EP0145935A1
Expired / Lapsed
EP
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Method and apparatus for detecting position and velocity of moving body
Assignee: Hitachi Ltd
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Filing: 1984-11-07
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Granted: —
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Expires: 2004-11-07
Abstract
Abstract @ A method for detecting the position and the velocity by using an encoder mounted directly on a moving body wherein original signals of the encoder are pulse-width modulated by using a sampling carrier wave and the position is detected by measuring the width of the pulses (T<sub>E</sub>) thus obtained. An apparatus for implementing the method comprises a carrier wave generation circuit (404), a pulse width modulation circuit (403) which pulse-width modulates the original signals coming from the encoder by using the carrier wave, a pulse width timer (402) which measures the width of the pulses thus modulated, and a microcomputer connected to the pulse width timer (402).
Inventors
- 👤 Shigeki Morinaga
- 👤 Yasuyuki Sugiura
- 👤 Kunio Miyashita
- 👤 Tadashi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/246; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/901; Y10S388/907; Y10S388/912; Y10S388/915
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A method for detecting the position and the velocity by using an encoder mounted directly on a moving body, comprising the steps of pulse-width modulating original signals of the encoder by using a sampling carrier wave, and measuring a pulse width of pulses (T E ) obtained by pulse-width modulating the original signals to detect the position.
Claim 2
Independent Claim
57 words
A method for detecting the position and the velocity by using an encoder mounted directly on a moving body, comprising the steps of pulse-width modulating original signals of the encoder by using a sampling carrier wave, and measuring a pulse width of pulses (T E ) obtained by pulse-width modulating the original signals to detect the position.
Claim 3
Dependent Claim
26 words
A method for detecting the position and the velocity according to Claim 1, wherein the velocity is detected on the basis of variations in the position.
Claim 4
Dependent Claim
31 words
A method for detecting the position and the velocity according to Claim 1, wherein the moving body is a motor and the encoder is mounted on the shaft of the motor.
Claim 5
Independent Claim
84 words
An apparatus for detecting the position and the velocity of a moving body by using an encoder mounted directly on a moving body, comprising: a carrier wave generation circuit (404) for generating a carrier wave; a pulse width modulation circuit (403) for pulse-width modulating original signals coming from the encoder by using the carrier wave; a pulse width timer (402) for measuring a pulse width of pulses obtained by pulse-width modulating the original signals; and a microcomputer connected to the pulse width timer (402).
Claim 6
Independent Claim
84 words
An apparatus for detecting the position and the velocity of a moving body by using an encoder mounted directly on a moving body, comprising: a carrier wave generation circuit (404) for generating a carrier wave; a pulse width modulation circuit (403) for pulse-width modulating original signals coming from the encoder by using the carrier wave; a pulse width timer (402) for measuring a pulse width of pulses obtained by pulse-width modulating the original signals; and a microcomputer connected to the pulse width timer (402).
Claim 7
Dependent Claim
31 words
An apparatus for detecting the position and the velocity according to Claim 4, wherein the moving body is a motor and the encoder is mounted on the shaft of the motor.
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