Method and apparatus for torque linearization in an electric power steering system - Patent Review 6441578

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Method and apparatus for torque linearization in an electric power steering system

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United States Patent

6441578

Link to this page

http://www.wikipatents.com/6441578.html

Inventor(s)

Mir; Sayeed A. (Saginaw, MI); Skellenger; Dennis B. (Vassar, MI)

Abstract

An exemplary embodiment of the invention is a method of controlling a motor in an electric power steering system. The method includes obtaining a motor control signal having an initial duty cycle and linearizing the initial duty cycle to obtain a secondary duty cycle. An offset is added to the secondary duty cycle to obtain an adjusted duty cycle. The motor is controlled using the adjusted duty cycle. An alternative embodiment is a torque linearization device for linearizing torque produced by a motor in response to a motor control signal having an initial duty cycle. The torque linearization device includes a comparator for receiving the initial duty cycle and comparing the initial duty cycle to a threshold. A linearization table converts the initial duty cycle to a linearized duty cycle. A selector receives the initial duty cycle and the linearized duty cycle and selects one of the initial duty cycle and the linearized duty cycle as a secondary duty cycle in response to the comparing.

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U.S. References

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6124688 Coles Sep,2000	Your vote accepted [0 after 0 votes]		6107767 Lu 318/561 Aug,2000	Your vote accepted [0 after 0 votes]
6051942 French Apr,2000	Your vote accepted [0 after 0 votes]		6049473 Jang 363/89 Apr,2000	Your vote accepted [0 after 0 votes]
6046560 Lu Apr,2000	Your vote accepted [0 after 0 votes]		6008599 Beck Dec,1999	Your vote accepted [0 after 0 votes]
6002226 Collier-Hallman Dec,1999	Your vote accepted [0 after 0 votes]		5998945 Elliott 318/254 Dec,1999	Your vote accepted [0 after 0 votes]
5977740 McCann 318/701 Nov,1999	Your vote accepted [0 after 0 votes]		5963706 Baik 388/804 Oct,1999	Your vote accepted [0 after 0 votes]
5920161 Obara 318/139 Jul,1999	Your vote accepted [0 after 0 votes]		5898990 Henry May,1999	Your vote accepted [0 after 0 votes]
5867380 Lee 363/98 Feb,1999	Your vote accepted [0 after 0 votes]		5852355 Turner 318/701 Dec,1998	Your vote accepted [0 after 0 votes]
5780986 Shelton 318/432 Jul,1998	Your vote accepted [0 after 0 votes]		5777449 Schlager 318/459 Jul,1998	Your vote accepted [0 after 0 votes]
5760562 Woodland 318/632 Jun,1998	Your vote accepted [0 after 0 votes]		5672944 Gokhale 318/254 Sep,1997	Your vote accepted [0 after 0 votes]
5645496 Endo 473/372 Jul,1997	Your vote accepted [0 after 0 votes]		5625542 Stemmler 363/41 Apr,1997	Your vote accepted [0 after 0 votes]
5616999 Matsumura Apr,1997	Your vote accepted [0 after 0 votes]		5579188 Dunfield 360/99.08 Nov,1996	Your vote accepted [0 after 0 votes]
5469215 Nashiki 318/432 Nov,1995	Your vote accepted [0 after 0 votes]		5451900 Haga Sep,1995	Your vote accepted [0 after 0 votes]
5444341 Kneifel, II 318/432 Aug,1995	Your vote accepted [0 after 0 votes]		5319294 Ohto 318/568.22 Jun,1994	Your vote accepted [0 after 0 votes]
5257828 Miller 180/446 Nov,1993	Your vote accepted [0 after 0 votes]		5223775 Mongeau 318/432 Jun,1993	Your vote accepted [0 after 0 votes]
5155419 Naito 318/254 Oct,1992	Your vote accepted [0 after 0 votes]		5122719 Bessenyei 318/629 Jun,1992	Your vote accepted [0 after 0 votes]
5069972 Versic Dec,1991	Your vote accepted [0 after 0 votes]		5063011 Rutz Nov,1991	Your vote accepted [0 after 0 votes]
4882524 Lee 318/254 Nov,1989	Your vote accepted [0 after 0 votes]		4868477 Anderson 318/696 Sep,1989	Your vote accepted [0 after 0 votes]
4825132 Gritter 318/811 Apr,1989	Your vote accepted [0 after 0 votes]		4691269 Yamane 363/41 Sep,1987	Your vote accepted [0 after 0 votes]
4661756 Murphy 318/701 Apr,1987	Your vote accepted [0 after 0 votes]		4628499 Hammett 700/56 Dec,1986	Your vote accepted [0 after 0 votes]
4556811 Hendricks 310/266 Dec,1985	Your vote accepted [0 after 0 votes]		4511827 Morinaga 318/254 Apr,1985	Your vote accepted [0 after 0 votes]
4458192 Sakamoto 318/798 Jul,1984	Your vote accepted [0 after 0 votes]		4447771 Whited 318/661 May,1984	Your vote accepted [0 after 0 votes]
4392094 Kuhnlein 318/254 Jul,1983	Your vote accepted [0 after 0 votes]		4300081 Van Landingham 318/599 Nov,1981	Your vote accepted [0 after 0 votes]
4240020 Okuyama 318/721 Dec,1980	Your vote accepted [0 after 0 votes]		4217508 Uzuka 310/46 Aug,1980	Your vote accepted [0 after 0 votes]
4027213 de Valroger 318/138 May,1977	Your vote accepted [0 after 0 votes]		3919609 Klautschek 318/803 Nov,1975	Your vote accepted [0 after 0 votes]
4868970 Schultz 29/596 Dec,1969	Your vote accepted [0 after 0 votes]
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Claims

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What is claimed is:

1. A method of controlling a motor in an electric power steering system, the method comprising:

obtaining a motor control signal having an initial duty cycle;

linearizing said initial duty cycle to obtain a secondary duty cycle;

adding an offset to said secondary duty cycle to obtain an adjusted duty cycle; and

controlling said motor using said adjusted duty cycle.

2. A method of controlling a motor in an electric power steering system, comprising:

obtaining a motor control signal having an initial duty cycle;

linearizing said duty cycle by comparing said initial duty cycle to a threshold, selecting said initial duty cycle as a secondary duty cycle if said initial duty cycle exceeds said threshold, adding an offset to said initial duty cycle to obtain a secondary duty cycle if said initial duty cycle does not exceed said threshold; and controlling said motor using said secondary duty cycle.

3. The method of claim 2 further comprising:

converting said initial duty cycle to a linearized duty cycle in response to a linearization table; and

selecting said linearized duty cycle as said secondary duty cycle if said initial duty cycle is less than said threshold.

4. The method of claim 3 further comprising obtaining said linearization table by:

positioning the motor in a set motor position;

measuring motor current for a plura