ANGULAR VELOCITY DETECTING APPARATUS

• US 20120227491A1
• Filed: 12/17/2009
• Published: 09/13/2012
• Est. Priority Date: 12/17/2009
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yamaoka, Hidehiko
• Application Number:
  US13/510,047
• Publication Number:
  US 20120227491A1
• Time in Patent Office: Days
• US Class Current: 73/504.12
• CPC Class Codes: G01C 19/5747 each sensing mass being connected to a driving mass, e.g. driving frames

Abstract

An angular velocity detecting apparatus includes a sensor chip having an angular velocity sensor installed therein, wherein the angular velocity sensor includes two mass elements which are driven in a drive direction in opposite phase with each other, and detects an angular velocity based on an oscillation of the mass elements in a direction perpendicular to the drive direction, the angular velocity detecting apparatus comprising: two acceleration sensors provided on the sensor chip, each of the acceleration sensors having a mass element which can oscillate in a single axis direction in a plane parallel to a substrate surface of the sensor chip, wherein the acceleration sensors are arranged in such a positional relationship that the mass elements of the acceleration sensors are oscillated in opposite phase with each other at the time of a rotational vibration of the sensor chip while the mass elements of the acceleration sensors are oscillated in phase with each other at the time of a translational vibration of the sensor chip.

Claims

1. An angular velocity detecting apparatus which includes a sensor chip having an angular velocity sensor installed therein, wherein the angular velocity sensor includes two mass elements which are driven in a drive direction in opposite phase with each other, and detects an angular velocity based on an oscillation of the mass elements in a direction perpendicular to the drive direction, the angular velocity detecting apparatus comprising:

two acceleration sensors provided on the sensor chip, each of the acceleration sensors having a mass element which can oscillate in a single axis direction in a plane parallel to a substrate surface of the sensor chip, wherein the acceleration sensors are arranged in such a positional relationship that the mass elements of the acceleration sensors are oscillated in opposite phase with each other at the time of a rotational vibration of the sensor chip while the mass elements of the acceleration sensors are oscillated in phase with each other at the time of a translational vibration of the sensor chip; and

a rotational vibration component removing part configured to remove, based on output signals of the acceleration sensors, a component due to the rotational vibration of the sensor chip in an output signal of the angular velocity sensor.

2. The angular velocity detecting apparatus of claim 1, wherein detection axes of the acceleration sensors do not pass through a center point of the rotational vibration of the sensor chip and are parallel to each other, and

the acceleration sensors are arranged on opposite sides with respect to a reference line, the reference line being parallel to the detection axes of the acceleration sensors and passing through the center point of the rotational vibration of the sensor chip.

3. The angular velocity detecting apparatus of claim 2, wherein the acceleration sensors are arranged symmetrically with respect to the center point of the rotational vibration of the sensor chip, or are arranged symmetrically with respect to the reference line.

5. The angular velocity detecting apparatus of claim 1, wherein the rotational vibration component removing part generates a chip rotation signal representing the rotational vibration of the sensor chip based on the output signals of the acceleration sensors, and subtracts the chip rotation signal from the output signal of the angular velocity sensor.

6. The angular velocity detecting apparatus of claim 1, wherein the rotational vibration component removing part generates a chip rotation signal representing the rotational vibration of the sensor chip based on the output signals of the acceleration sensors, and applies forces to the mass elements of the acceleration sensors in such a direction as to reduce an oscillation due to the rotational vibration of the sensor chip.

7. The angular velocity detecting apparatus of claim 1, wherein the detection axes of the acceleration sensors are parallel to the drive direction of the angular velocity sensor.

4. (canceled)