In-vehicle device for detecting driving condition and computer program product for use in the same
First Claim
1. An in-vehicle device for detecting a driving condition of an automotive vehicle, the in-vehicle device being part of a navigation device, comprising:
- a first sensor for detecting one of acceleration of the vehicle and angular speed of the vehicle, wherein the angular speed is defined around a predetermined axis of the vehicle;
a second sensor for detecting one of the acceleration of the vehicle and the angular speed of the vehicle;
a first determination unit for determining whether a first detection signal from the first sensor is varied with a first frequency equal to or larger than a predetermined first determination frequency and with a first variation amount larger than a predetermined first variation threshold;
a second determination unit for determining whether a second detection signal from the second sensor is varied with a second frequency equal to or larger than a predetermined second determination frequency and with a second variation amount larger than a predetermined second variation threshold; and
a vibration noise removal unit for determining that a vibration noise caused by vertical vibration of the vehicle is superimposed on each detection signal of the first and second sensors when both of the first and second determination units determine that each detection signal is varied with the frequency equal to or larger than the determination frequency and with the variation amount larger than the variation threshold, whereinthe vibration noise removal unit removes the vibration noise from each detection signal when the vibration noise removal unit determines that the vibration noise is superimposed on each detection signal, andthe vibration noise is defined by the determination frequency and the variation threshold,wherein the in-vehicle device is a part of a navigation device.
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Accused Products
Abstract
An in-vehicle device for detecting a driving condition includes: first and second sensors for detecting one of acceleration and angular speed; first and second determination units for determining whether a detection signal from each sensor is varied with a frequency equal to or larger than a predetermined determination frequency and with a variation amount larger than a predetermined variation threshold; and a vibration noise removal unit for determining that a vibration noise is superimposed on each detection signal. The vibration noise removal unit removes the vibration noise from each detection signal.
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Citations
10 Claims
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1. An in-vehicle device for detecting a driving condition of an automotive vehicle, the in-vehicle device being part of a navigation device, comprising:
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a first sensor for detecting one of acceleration of the vehicle and angular speed of the vehicle, wherein the angular speed is defined around a predetermined axis of the vehicle; a second sensor for detecting one of the acceleration of the vehicle and the angular speed of the vehicle; a first determination unit for determining whether a first detection signal from the first sensor is varied with a first frequency equal to or larger than a predetermined first determination frequency and with a first variation amount larger than a predetermined first variation threshold; a second determination unit for determining whether a second detection signal from the second sensor is varied with a second frequency equal to or larger than a predetermined second determination frequency and with a second variation amount larger than a predetermined second variation threshold; and a vibration noise removal unit for determining that a vibration noise caused by vertical vibration of the vehicle is superimposed on each detection signal of the first and second sensors when both of the first and second determination units determine that each detection signal is varied with the frequency equal to or larger than the determination frequency and with the variation amount larger than the variation threshold, wherein the vibration noise removal unit removes the vibration noise from each detection signal when the vibration noise removal unit determines that the vibration noise is superimposed on each detection signal, and the vibration noise is defined by the determination frequency and the variation threshold, wherein the in-vehicle device is a part of a navigation device. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. A computer program product in a computer readable medium for use in an in-vehicle device, which is part of a navigation device, for detecting a driving condition of an automotive vehicle, the product comprising:
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an instruction for detecting one of acceleration of the vehicle and angular speed of the vehicle with a first sensor, wherein the angular speed is defined around a predetermined axis of the vehicle; an instruction for detecting one of the acceleration of the vehicle and the angular speed of the vehicle with a second sensor; an instruction for determining with a first determination unit whether a first detection signal from the first sensor is varied with a first frequency equal to or larger than a predetermined first determination frequency and with a first variation amount larger than a predetermined first variation threshold; an instruction for determining with a second determination unit whether a second detection signal from the second sensor is varied with a second frequency equal to or larger than a predetermined second determination frequency and with a second variation amount larger than a predetermined second variation threshold; and an instruction for determining with a vibration noise removal unit that a vibration noise caused by vertical vibration of the vehicle is superimposed on each detection signal when both of the first and second determination units determine that each detection signal is varied with the frequency equal to or larger than the determination frequency and with the variation amount larger than the variation threshold, wherein the vibration noise removal unit removes the vibration noise from each detection signal when the vibration noise removal unit determines that the vibration noise is superimposed on each detection signal, and the vibration noise is defined by the determination frequency and the variation threshold, wherein the in-vehicle device is a part of a navigation device. - View Dependent Claims (9)
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10. An in-vehicle device for detecting a driving condition of an automotive vehicle, the in-vehicle device being part of a navigation device, comprising:
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a first sensor configured to detect one of acceleration of the vehicle and angular speed of the vehicle, wherein the angular speed is defined around a predetermined axis of the vehicle; a second sensor configured to detect one of the acceleration of the vehicle and the angular speed of the vehicle; a first determination unit configured to determine whether a first detection signal from the first sensor is varied with a first frequency equal to or larger than a predetermined first determination frequency and with a first variation amount larger than a predetermined first variation threshold; a second determination unit configured to determine whether a second detection signal from the second sensor is varied with a second frequency equal to or larger than a predetermined second determination frequency and with a second variation amount larger than a predetermined second variation threshold; and a vibration noise removal unit configured to determine that a vibration noise caused by vertical vibration of the vehicle is being superimposed on each detection signal of the first and second sensors when both of the first and second determination units determine that each detection signal is varied with the frequency equal to or larger than the determination frequency and with the variation amount larger than the variation threshold, otherwise determining that the vibration noise caused by the vertical vibration is not being superimposed, the vibration noise removal unit removing the determined vibration noise from each detection signal when the vibration noise removal unit determines that the vibration noise is being superimposed on each detection signal, and not removing the vibration noise when the vibration noise removal unit determines that vibration noise is not being superimposed, the vibration noise being defined by the determination frequency and the variation threshold, the in-vehicle device being a part of a navigation device.
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Specification