Zero-point correction device for a gravity-type accelerometer
First Claim
1. A zero-point correction device for a gravity-type accelerometer employed in a vehicle having a plurality of wheels, comprising:
- means for detecting a rotational wheel speed of at least one wheel of said vehicle at each operation cycle;
means for calculating an estimated vehicle acceleration Aw from said rotational wheel speed;
means for measuring a gravitationally detected acceleration Am based on said gravity-type accelerometer;
means for producing an adjustment speed k which is between O and 1 based on said estimated vehicle acceleration Aw and said gravitationally detected acceleration Am;
means for subtracting a correction amount Ao obtained each operation cycle from said gravitationally detected acceleration Am to produce a corrected acceleration Ac which is a corrected version of said gravitationally detected acceleration Am;
means for calculating said correction amount Ao for a present operation cycle by adding to said correction amount Ao obtained for a previous operation cycle, a product of said adjustment speed k multiplied by a difference between said corrected acceleration Ac and said estimated vehicle acceleration Aw, and means for utilizing said calculated correction amount Ao for controlling a wheel behavior control system.
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Accused Products
Abstract
A zero-point correction device for a gravity-type accelerometer employed in a vehicle having wheels, includes a calculator for calculating an estimated vehicle acceleration Aw based on the wheel speed, and a detector for detecting a gravitationally detected acceleration Am based on said gravity-type accelerometer. A subtractor is provided for subtracting a correction amount Ao obtained in each operation cycle from the gravitationally detected acceleration Am to produce a corrected acceleration Ac which is a corrected version of said gravitationally detected acceleration Am. The correction amount Ao for the present operation cycle is obtained by adding to the correction amount Ao obtained in the previous cycle, a value commensurate with a difference between the estimated vehicle acceleration Aw and the corrected acceleration Ac.
74 Citations
21 Claims
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1. A zero-point correction device for a gravity-type accelerometer employed in a vehicle having a plurality of wheels, comprising:
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means for detecting a rotational wheel speed of at least one wheel of said vehicle at each operation cycle;
means for calculating an estimated vehicle acceleration Aw from said rotational wheel speed;means for measuring a gravitationally detected acceleration Am based on said gravity-type accelerometer; means for producing an adjustment speed k which is between O and 1 based on said estimated vehicle acceleration Aw and said gravitationally detected acceleration Am; means for subtracting a correction amount Ao obtained each operation cycle from said gravitationally detected acceleration Am to produce a corrected acceleration Ac which is a corrected version of said gravitationally detected acceleration Am; means for calculating said correction amount Ao for a present operation cycle by adding to said correction amount Ao obtained for a previous operation cycle, a product of said adjustment speed k multiplied by a difference between said corrected acceleration Ac and said estimated vehicle acceleration Aw, and means for utilizing said calculated correction amount Ao for controlling a wheel behavior control system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A zero-point correction device for a gravity-type accelerometer used to determine an estimated speed of a vehicle, comprising:
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a detector that detects a rotational speed of a wheel of said vehicle; an acceleration estimation calculator that calculates an estimated vehicle acceleration Aw from said detected rotational speed of said wheel; said gravity-type accelerometer detecting a gravitational acceleration Am; a speed adjuster that sets an adjustment speed k based on said estimated vehicle acceleration Aw and said gravitationally detected acceleration Am; a subtractor that subtracts a correction amount Ao obtained in each operation cycle from said detected gravitational acceleration Am to produce a corrected acceleration Ac which represents a corrected version of said detected gravitational acceleration Am; a calculator that calculates said correction amount Ao for a present operation cycle by adding to said correction amount Ao obtained in a previous operation cycle, a product of said adjustment speed k multiplied by a difference between said corrected acceleration Ac and said estimated vehicle acceleration Aw; and a wheel control system that controls an operating condition of said wheel in accordance with said calculated correction amount Ao. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A zero-point correction device for a gravity-type accelerometer, comprising:
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a detector that determines an estimated acceleration, of a rotating object; said gravity-type accelerometer detecting a gravitational acceleration Am; a rotational speed adjuster that sets an adjustment speed in response to said estimated acceleration and said detected gravitational acceleration; means for producing a corrected acceleration based upon a corrected version of said detected gravitational acceleration; a calculator that calculates a correction amount by multiplying said adjustment speed by a difference between said corrected acceleration and said estimated acceleration; and a control system that controls an operating condition of said rotating object in accordance with said calculated correction amount. - View Dependent Claims (20, 21)
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Specification