Inertia detection device
AssigneeDenso Corporation
InventorsChao Chen, Naoki Yoshida
Life of this patent
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Abstract
An inertia detection device includes one set of gyro sensors for detecting an angular velocity of a detection target object along a same direction, the gyro sensors arranged in a same physical quantity range, in which sensor movement is detectable as a same physical quantity. When an abnormality affecting an output signal of one of the gyro sensors is caused, based on an observation that a difference of magnitudes of the output signals from normal and abnormal gyro sensors is different from a difference of magnitudes of the output signals from two normal gyro sensors, such an abnormality of one of the gyro sensors is determinable by a comparison between the output signals, without using an estimated value thereof.
Claims19
An inertia detection device comprising:
- one set of inertia sensors arranged in a same physical quantity range in which sensor movement is detected as the same physical quantity, for the set of inertia sensors to detect a physical quantity along a same direction due to a movement of a detection target object, the one set of inertia sensors includes a first sensor configured to output a first output signal and a second sensor configured to output a second output signal, such that a sign of the first output signal is opposite to a sign of the second output signal, and
- an abnormality determination unit configured to determine that one of the first sensor and the second sensor is abnormal in response to a sum of the first output signal and the second output signal being greater than a difference threshold, wherein
- when one of the first sensor and the second sensor is determined to be abnormal, the abnormality determination unit is configured to
- compare the first output signal with a first output signal threshold value,
- compare the second output signal with a second output signal threshold value, and
- specify which of the first sensor or the second sensor is abnormal,
- wherein
- the first output signal threshold value and the second output signal threshold value are determined for the first sensor and the second sensor, respectively.
An inertial detection device comprising:
- a first sensor configured to:
- (i) detect a first angular velocity about a first sensor axis, and
- (ii) generate a first angular velocity signal;
- a second sensor configured to:
- (i) detect a second angular velocity about a second sensor axis, and
- (ii) generate a second angular velocity signal,
- wherein the first sensor axis points:
- (i) in a same direction as the second sensor axis, or
- (ii) in an opposite direction that is defined as opposite to the second sensor axis,
- an abnormality determination unit configured to determine that one of the first sensor and the second sensor is abnormal in response to a first error condition being satisfied, wherein the first error condition is associated with:
- (i) the first angular velocity,
- (ii) the second angular velocity, and
- (iii) a difference threshold,
- wherein
- when one of the first sensor and the second sensor is determined to be abnormal, the abnormality determination unit is configured to
- compare the first output signal with a first output signal threshold value,
- compare the second output signal with a second output signal threshold value, and
- specify which of the first sensor or the second sensor is abnormal, and
- wherein
- the first output signal threshold value and the second output signal threshold value are determined for the first sensor and the second sensor, respectively.
Dependencies are inferred from the claim text.