Mounting angle detection device
First Claim
1. Amounting angle detection device for detecting amounting angle of a vehicle-mounted device mounted in a vehicle, comprising:
- an acceleration sensor mounted in the vehicle-mounted device; and
a mounting angle processor, wherein the mounting angle processor determines a sine value of a mounting angle in a pitch direction of the vehicle-mounted device by dividing a totalized and averaged value by acceleration of gravity, the totalized and averaged value being determined by totalizing and averaging acceleration detected by the acceleration sensor.
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Accused Products
Abstract
A mounting angle processor for determining a mounting angle of a vehicle-mounted device based on an acceleration sensor, a gyroscopic sensor and GPS receiver mounted in the vehicle mounted device, and a comparator for comparing the determined mounting angle and a permissible range corresponding thereto are provided. If the determined mounting angle is out of the permissible range, it is determined that the mounting angle is abnormal. Thus, a mounting angle detection device is provided for preventing the vehicle-mounted device such as a navigation device from being mounted at an improper angle, or for maintaining the accuracy of the vehicle-mounted device even in a case where the mounting angle of the vehicle-mounted device has been changed.
51 Citations
11 Claims
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1. Amounting angle detection device for detecting amounting angle of a vehicle-mounted device mounted in a vehicle, comprising:
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an acceleration sensor mounted in the vehicle-mounted device; and
a mounting angle processor, wherein the mounting angle processor determines a sine value of a mounting angle in a pitch direction of the vehicle-mounted device by dividing a totalized and averaged value by acceleration of gravity, the totalized and averaged value being determined by totalizing and averaging acceleration detected by the acceleration sensor. - View Dependent Claims (4, 5, 6, 7)
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2. Amounting angle detection device for detecting a mounting angle of a vehicle-mounted device mounted in a vehicle, comprising:
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an acceleration sensor and a GPS receiver mounted in the vehicle-mounted device; and
a mounting angle processor, wherein the mounting angle processor includes;
a pitch angle processor for determining a sine value of a mounting angle in a pitch direction of the vehicle-mounted device by dividing a totalized and averaged value by acceleration of gravity, the totalized and averaged value being determined by totalizing and averaging acceleration detected by the acceleration sensor; and
a yaw angle processor for determining a cosine value of a mounting angle in a yaw direction of the vehicle-mounted device by subtracting a product of the acceleration of gravity and the sine value of the mounting angle in the pitch direction from acceleration detected by the acceleration sensor to determine a subtracted value, and then dividing the subtracted value by a value determined by multiplying reference acceleration obtained from the GPS receiver or from a vehicle speed pulse sensor by a cosine value of the mounting angle in the pitch direction.
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3. Amounting angle detection device for detecting amounting angle of a vehicle-mounted device mounted in a vehicle, comprising:
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an acceleration sensor, a GPS receiver and a gyroscopic sensor mounted in the vehicle-mounted device; and
a mounting angle processor, wherein the mounting angle processor includes;
a pitch angle processor for determining a sine value of a mounting angle in a pitch direction of the vehicle-mounted device by dividing a totalized and averaged value by acceleration of gravity, the totalized and averaged value being determined by totalizing and averaging acceleration detected by the acceleration sensor;
a sensitivity detector for determining a ratio of angular velocity detected by the gyroscopic sensor to reference angular velocity obtained from the GPS receiver as sensitivity of the gyroscopic sensor; and
a roll angle processor for determining a cosine value of a mounting angle in a roll direction of the vehicle-mounted device by dividing the determined sensitivity of the gyroscopic sensor by a cosine value of the mounting angle in the pitch direction.
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8. A mounting angle detecting device for a vehicle-mounted device, comprising:
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a sensitivity detector for determining a ratio of angular velocity detected by a gyroscopic sensor mounted in the vehicle-mounted device to reference angular velocity obtained from a GPS receiver mounted in the vehicle-mounted device as sensitivity of the gyroscopic sensor; and
a comparator for comparing the sensitivity of the gyroscopic sensor determined by the sensitivity detector to a permissible range concerning the sensitivity and then determining that the mounting angle of the vehicle-mounted device is abnormal when the sensitivity is over the permissible range. - View Dependent Claims (10)
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9. A mounting angle detecting device for a vehicle-mounted device, comprising:
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a sensitivity detector for determining a ratio of angular velocity detected by a gyroscopic sensor mounted in a vehicle-mounted device to reference angular velocity obtained from a GPS receiver mounted in the vehicle-mounted device as sensitivity of the gyroscopic sensor; and
a comparator for comparing the sensitivity determined by the sensitivity detector to sensitivity determined last time by the sensitivity detector and then determining that the mounting angle of the vehicle-mounted device has been changed when the sensitivity determined by the sensitivity detector differs from the sensitivity determined last time. - View Dependent Claims (11)
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Specification