Zero-point correction device for a gravity-type accelerometer

A zero-point correction device for a gravity-type accelerometer used to determine an estimated speed of a vehicle, comprising:

• 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.

A zero-point correction device for a gravity-type accelerometer, comprising:

• 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.