Vehicle orientation detection method and vehicle orientation detection apparatus
First Claim
1. A vehicle orientation detection method detecting a vehicle orientation on a basis of data measured at each predetermined time interval when a vehicle travels, the vehicle including a GPS receiver that receives a signal of a GPS satellite, a yaw rate sensor that detects a yaw rate, a lateral acceleration sensor that detects a lateral acceleration and a vehicle speed sensor that detects a vehicle speed, the vehicle orientation detection method comprising:
- detecting the vehicle orientation of the vehicle which travels less than a reference speed on a basis of the yaw rate detected by the yaw rate sensor when a detection speed of the vehicle speed sensor is less than the reference speed, the vehicle orientation being a heading orientation toward which the vehicle travels;
performing drift determination to determine whether the vehicle is in a drift state when the detection speed of the vehicle speed sensor is equal to or greater than the reference speed;
when the vehicle is not determined to be in the drift state in the drift determination, detecting the vehicle orientation on a basis of the signal received by the GPS receiver; and
when the vehicle is determined to be in the drift state in the drift determination, detecting the vehicle orientation of the vehicle which travels at or greater than the reference speed on the basis of the yaw rate detected by the yaw rate sensor.
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Accused Products
Abstract
In this vehicle orientation detection method detecting the orientation of a vehicle on the basis of measurement data obtained at prescribed time intervals, as long as a speed sensed by a vehicle speed sensor is less than a threshold speed, the vehicle orientation is detected on the basis of a yaw rate sensed by a yaw rate sensor. If the speed detected by the vehicle speed sensor is greater than or equal to the threshold speed, a drift determination is performed. If not determined to be in a drift state, the vehicle orientation is detected on the basis of signals received by a GPS receiver, and if determined to be in a drift state, the vehicle orientation is detected on the basis of the yaw rate sensed by the yaw rate sensor.
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Citations
8 Claims
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1. A vehicle orientation detection method detecting a vehicle orientation on a basis of data measured at each predetermined time interval when a vehicle travels, the vehicle including a GPS receiver that receives a signal of a GPS satellite, a yaw rate sensor that detects a yaw rate, a lateral acceleration sensor that detects a lateral acceleration and a vehicle speed sensor that detects a vehicle speed, the vehicle orientation detection method comprising:
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detecting the vehicle orientation of the vehicle which travels less than a reference speed on a basis of the yaw rate detected by the yaw rate sensor when a detection speed of the vehicle speed sensor is less than the reference speed, the vehicle orientation being a heading orientation toward which the vehicle travels; performing drift determination to determine whether the vehicle is in a drift state when the detection speed of the vehicle speed sensor is equal to or greater than the reference speed; when the vehicle is not determined to be in the drift state in the drift determination, detecting the vehicle orientation on a basis of the signal received by the GPS receiver; and when the vehicle is determined to be in the drift state in the drift determination, detecting the vehicle orientation of the vehicle which travels at or greater than the reference speed on the basis of the yaw rate detected by the yaw rate sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle orientation detection apparatus that detects a vehicle orientation of a vehicle on a basis of a GPS signal that a GPS receiver receives from a GPS satellite at each predetermined time interval, a yaw rate detected by a yaw rate sensor at each predetermined time interval, a lateral acceleration detected by a lateral acceleration sensor at each predetermined time interval, and a vehicle speed detected by a vehicle speed sensor at each predetermined time interval, the vehicle orientation detection apparatus comprising:
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a vehicle speed determination portion determining whether the vehicle speed detected by the vehicle speed sensor is equal to or greater than a reference speed regarding each data at each predetermined time interval; a drift determination portion determining whether the vehicle is in a drift state when the vehicle speed determination portion determines that the vehicle speed is equal to or greater than the reference speed; and a vehicle orientation detection portion detecting the vehicle orientation of the vehicle which travels less than the reference speed on a basis of the yaw rate of the yaw rate sensor when the vehicle speed determination portion determines that the vehicle speed is less than the reference speed, the vehicle orientation being a heading orientation toward which the vehicle travels, detecting the vehicle orientation on a basis of the yaw rate of the yaw rate sensor when the drift determination portion has determined that the vehicle is in the drift state, and detecting the vehicle orientation on a basis of a signal received by the GPS receiver other than a case where the vehicle speed determination portion determines that the vehicle speed is less than the reference speed and a case where the drift determination portion determines that the vehicle is in the drift state.
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Specification