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System for processing position signals to improve resolution of the position of an object
| Details |
Inventors: Nakazato, Masakazu; Tsuchiya, Yoshitsugu; Ikenoya, Kazuhisa; Shimoura, Yoichi;
Assignee: Kayaba Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Strecker; Gerard R.
Assistant Examiner: Edmonds; W. S.
Attorney, Agent or Firm: Jordan and Hamburg
System for processing fine position signals pulse-width modulates signals from two magnetic sensors for producing sinusoidal wave signals different from each other in phase by a quarter cycle in correspondence with the scale pitches, then switches the phase so as to bring the pair of pulse-modulated signals in phase with each other, then calculates the weight constants for the pair of pulse-width modulated signals in phase in order that of said pair of pulse-width modulated signals in phase, any one having a higher linearity will be treated at a handsome rate, and then subjects said pulse-width modulated signals to weighted mean by the use of the resultant weight constants, with the result that the pair of pulse-width modulated signals will become free from disorder at the switching point, thereby producing signals of a high accuracy representing fine positions corresponding to the scale pitch divided at regular intervals. |
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DETAILED DESCRIPTION In accordance with the present invention, a pair of sensor signals from a first and second magnetic sensors operable to produce sinusoidal wave signals each having phase difference by a quarter cycle with respect to each other in correspondence with each scale pitch are pulse-width modulated using high frequency sinusoidal waves as a modulating signal.
The pair of pulse-width modulated signals are so processed as to be in phase.
The weight constants for the two pulse-width modulated signals in phase is calculated in order that, of these pulse-width modulated in phase, any one having a high linearity will be treated at an enhanced rate.
If said pair of pulse-width modulated signals in phase are subjected to a weighted mean by the use of the weight constants, the pulse-width modulated signals in phase with each other will not fall into disorder to insure that signals of high accuracy representing fine positions based on the scale pitches divided at uniform intervals.
The system preferably comprises means for dividing one cycle of said first magnetic sensor signal into four quarter cycle sections, means for inverting a second quarter cycle signal counting from the top of said four sections, means for selecting said inverted second quarter cycle signal and a top quarter cycle signal of the four quarter cycle sections, means for dividing one cycle of said second magnetic sensor signal into two half cycle sections, means for selecting the former half cycle, and means for pulse-width modulating said first magnetic sensor signals and the selected signal of said second magnetic sensor by the high frequency sinusoidal wave signals.
Addition is preferably made of a phase switching means for bringing the former half cycle signal of said magnetic sensor and pulse-width modulated signal in phase with one another by shifting down the pulse-width modulated first quarter cycle signal of said first magnetic sensor by a duty ratio of 0.
5, and shifting up the pulse-width modulated second reversed quarter cycle signal by a duty ratio of 0
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Fault Detection 
