Electricity: motive power systems – Positional servo systems
Patent
1989-06-27
1990-05-29
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
318569, 318575, 318468, 318101, G05B 1919, G02B 718
Patent
active
049298780
ABSTRACT:
A mirror control system for electrically powered and positioned mirrors (FIG. 1) of the "memory" type for, for example, moving an automotive side view mirror from its current position to a desired "memory" position, and a special algorithm therefor (FIG. 2), which initially moves the mirror toward the final, desired position at a forty-five (45.degree.) degree angle to the vertical and horizontal axes (NE, NW, SW or SE; FIG. 6), for a mirror whose two directional motors have equal speeds (X=Y). If no obstruction (e.g., the mirror's edge) is encountered (FIG. 3), the mirror is moved by both motors until either the vertical or horizontal axis of the final position is encountered, at which axis intersection point the mirror is moved by only the appropriate one of the motors until the final point along the remaining axis is reached; this is the "normal" mode of the algorithm. However, if an obstruction is encountered (left side of FIG. 2; FIGS. 4 and 5), the mirror is moved at a 45.degree. degree angle toward its center point (or a "safe" central position) until its reaches either the center point's vertical (FIG. 4) or horizontal (FIG. 5) axis, and then a single motor is used until the center point is reached. THe analogous "normal" mode is then used to move the mirror to its final position. If the speeds of the horizontal axis and vertical axis direction motors are not equal (X.noteq.Y, respectively), then the angle for the initial movement(s) is "arc tangent (Y.div.X)".
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Ro Bentsu
United Technologies Automotive Inc.
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