US Patent No: 6,510,396
Number of patents in Portfolio can not be more than 2000
Symmetry compensation for encoder pulse width variation
Stats
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Jan 21, 2003
Issued date -
Sep 13, 2000
filing date -
09/661,221
serial no -
In Force
status
Importance
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Abstract
A method of compensating for errors in the measurement of the kinematic properties of an electric power steering motor for an automobile is disclosed. The method comprises generating a set of M-ary signals; measuring the pulse width of the set of M-ary signals; and measuring the time between the edges of the set of M-ary signals. The motor velocity may be directly measured by a tachometer or other such device. The motor position signal can be used to estimate the angular velocity of the motor, by determining the change in angular position of the motor divided by the change in time.
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First Claim
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International Classification(s)
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- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,029,466 System for detecting abnormality of steering angle sensor | 14 | 1990 | |
| 5,309,758 Steering angle sensor for automobile | 14 | 1992 | |
| 6,286,621 Electric power steering apparatus | 12 | 2000 | |
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| 4,955,228 Device for detecting rotation of steering wheel for automobiles | 9 | 1989 | |
| 5,088,319 Steering angle sensor | 14 | 1990 | |
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| 6,250,417 Power steering apparatus | 5 | 1999 | |
| 6,244,372 Power steering apparatus | 17 | 1999 | |
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| 4,838,074 Steering torque detecting device | 10 | 1988 | |
| 6,246,197 Electric power steering controller | 16 | 1998 | |
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| 4,836,319 Steering control apparatus for motor vehicles | 28 | 1987 | |
| 5,828,973 Electric power steering apparatus | 18 | 1996 | |
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| 4,897,603 Arrangement for determining the speed and rotor position of an electric machine | 12 | 1989 | |
| 5,027,648 Method and device for measuring the angle of rotation of the steering shaft of a motor vehicle | 18 | 1989 | |
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| 4,961,017 Stator for use in a brushless motor | 24 | 1988 | |
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| 5,736,852 Circuit and method for conditioning a wheel speed sensor signal | 13 | 1995 | |
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| 6,155,106 Steering angle sensor unit | 18 | 1998 | |
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| 5,408,153 Index position detecting apparatus for an electromagnetic rotary machine | 30 | 1994 | |
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| 5,902,342 Detection of vibration in an AC traction system | 6 | 1997 | |
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| 4,922,197 High resolution proximity detector employing magnetoresistive sensor disposed within a pressure resistant enclosure | 50 | 1988 | |
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| 4,924,696 Noncontacting position sensor for an automotive steering system | 22 | 1989 | |
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| 5,218,279 Method and apparatus for detection of physical quantities, servomotor system utilizing the method and apparatus and power steering apparatus using the servomotor system | 18 | 1991 | |
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| 4,562,399 Brushless DC tachometer | 44 | 1983 | |
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| 5,293,125 Self-aligning tachometer with interchangeable elements for different resolution outputs | 27 | 1992 | |
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| 4,437,061 Speed detector for sewing machines | 10 | 1981 | |
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| 5,223,760 Wheel speed sensor for drive axle | 21 | 1991 | |
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| 5,498,072 Anti-skid control system for automotive vehicles | 22 | 1995 | |
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| 5,329,195 Sensor motor | 25 | 1992 | |
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| 5,717,268 Electric motor with tachometer signal generator | 17 | 1996 | |
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| 6,244,373 Steering control apparatus for vehicle | 10 | 1999 | |
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| 4,924,161 Position and speed detecting device | 13 | 1989 | |
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| 4,803,425 Multi-phase printed circuit board tachometer | 18 | 1987 | |
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| 4,983,915 Device for determining the rotary angle position of rotary drives of electrical machines by evaluation of electrical voltages by sensors responding to rotary movements | 21 | 1988 | |
| 5,406,267 Method and apparatus for the monitoring of the operation of linear and rotary encoders | 16 | 1992 | |
| 5,503,421 Clutch and control mechanism for fifth wheel | 9 | 1993 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jul 21, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
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| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
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