Moving object controller containing a differential of acceleration measurer
First Claim
1. An acceleration differential sensor for directly detecting differential of acceleration comprising:
- electromagnetic force generating means having a coil and a magnet;
a movable member driven by said electromagnetic force generating means;
displacement detecting means for detecting the displacement of said movable member;
current supply means for supplying current to said coil of said electromagnetic force generating means on the basis of output of said displacement detection means so that said movable member is positioned at a reference position; and
voltage detecting means for detecting the voltage of said coil produced by said current to position the movable member at said reference position, wherein said voltage directly corresponds to the differential of acceleration.
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Accused Products
Abstract
In order to control a movable object such as an automobile, the differential of acceleration is derived and used as control information. In order to derive that differential, a value representing the acceleration may be differentiated, but preferably a sensor is provided which generates a direct measurement of the differential of acceleration. In one example of such a sensor, a pendulum has a coil thereon which interacts with the magnetic field of a magnet on a casing supporting the pendulum. A current is supplied to the coil such as to generate a force resisting movement of the pendulum. It is then found that the voltage across the coil corresponds to the differential of acceleration.
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Citations
11 Claims
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1. An acceleration differential sensor for directly detecting differential of acceleration comprising:
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electromagnetic force generating means having a coil and a magnet; a movable member driven by said electromagnetic force generating means; displacement detecting means for detecting the displacement of said movable member; current supply means for supplying current to said coil of said electromagnetic force generating means on the basis of output of said displacement detection means so that said movable member is positioned at a reference position; and voltage detecting means for detecting the voltage of said coil produced by said current to position the movable member at said reference position, wherein said voltage directly corresponds to the differential of acceleration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An acceleration differential sensor for directly detecting differential of acceleration, comprising:
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a casing; a pendulum attached to said casing at one end thereof; a pair of movable electrodes attached to said pendulum at opposite sides in a pendulum-moving direction, respectively; a pair of electrodes provided on said casing so as to oppose said movable electrodes, respectively; a coil attached to said pendulum between said joint and said movable electrodes; magnet means provided on said casing so that a polarity thereof opposes a side of said coil and the other polarity opposes the opposite side of said coil in the pendulum-moving direction; a pair of fixed electrodes fixed to said casing so as to oppose said movable electrodes, respectively; displacement detecting means, electrically connected to said movable and fixed electrodes, for detecting the displacement of said pendulum; current supply means for supplying current to said coil on the basis of an output of said displacement detection means so that said pendulum is positioned at a reference position; and voltage detecting means for detecting the voltage of said coil produced by said current to position the pendulum at said reference position, wherein said voltage directly corresponds to the differential of acceleration. - View Dependent Claims (8, 9, 10, 11)
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Specification