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 Title: |
US6988570:
Direction control device of control target
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Takeuchi, Kesatoshi; Suwa, Japan
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| Assignee: |
Seiko Epson Corporation, Tokyo, Japan
other patents from SEIKO EPSON CORPORATION (503380) (approx. 5,431)
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| Published / Filed: |
2006-01-24
/ 2002-04-22
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| Application Number: |
US2002000126961
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| IPC Code: |
Advanced:
B60L 11/18;
B60L 15/20;
B62D 11/02;
B62D 11/04;
B62D 11/18;
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| ECLA Code: |
B60L11/18E; B60L15/20D; B62D11/04; B62D11/18B; L60L200/22; Y02T10/70; Y02T10/70B;
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| U.S. Class: |
180/006.48;
180/006.5;
318/432;
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| Field of Search: |
180/6.24,6.5,411,6.26,6.28,6.48
318/432-434,437,34,41,53,66,85,489,911
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| Priority Number: |
| 2001-04-20 |
JP2001000123411 |
| 2001-04-20 |
JP2001000123412 |
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| Abstract: |
The left and right rear drive wheels of a vehicle are controlled independently, and the traveling direction of the vehicle is changed by providing a rotational speed difference between each of the left and right rear drive wheel. A vehicle operator merely designates the turning direction by moving an operation stick, e.g., to the left or right, which will in turn enable an automatic turn at an optimum curvature to be performed which frees the vehicle operator from complicated steering operations. A highly precise and responsive turn is achieved when the left and right independent control is implemented with a PLL control circuit.
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| Attorney, Agent or Firm: |
Nixon Peabody LLP ;
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| Primary / Asst. Examiners: |
Morris, Lesley D.; Lum, L.
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 15 claims |
1. A direction control device capable of controlling a direction of a control target including a plurality of driving means by individually controlling said driving means, comprising: a drive control means for controlling a drive of respective drive means; a target direction commanding means for commanding a target direction for a movement of said control target; and a drive characteristic difference setting means for setting a drive characteristic difference in work speed between the respective driving means such that the direction of said control target is controlled in said target direction: wherein said drive control means controls the drive of each of said driving means in accordance with said drive characteristic difference in work speed and comprises a control circuit adapted to control feedback to each of said driving means such that a drive characteristic difference detection result will become a set value as said drive characteristic and wherein said control circuit comprises a PLL control circuit which controls each of said driving means based on a phase difference of a reference signal frequency and a drive state detection signal frequency of said driving means and wherein said control circuit sets said phase difference initially based on said drive characteristic set.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 16 U.S. patent(s) that reference this one
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