Method and apparatus for measuring speed of land vehicle using accelerometer
First Claim
1. A method for measuring the speed of a moving land vehicle using an accelerometer, which comprises:
- storing measurement data provided from an accelerometer;
analyzing the measurement data to determine whether the vehicle is stopped;
calculating a road angle using the measurement data of the accelerometer when it is determined, upon analysis, that the vehicle is moving;
determining the sign of the road angle when the road angle is greater than a threshold value;
compensating for a gravitational acceleration component included in the measurement data of the accelerometer using the road angle; and
calculating the speed of the vehicle based on the acceleration of the vehicle with the gravitational acceleration component compensated.
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Accused Products
Abstract
Disclosed is an apparatus and a method for measuring the speed of a land vehicle using an accelerometer. The method includes the steps of storing measurement data provided from an accelerometer; analyzing the measurement data to determine whether the vehicle is stopped; calculating a road angle using the measurement data of the accelerometer when it is determined, upon analysis, that the vehicle is moving; determining the sign of the road angle when the road angle is greater than a threshold value; compensating for a gravitational acceleration component included in the measurement data of the accelerometer using the road angle; and calculating the speed of the vehicle based on the acceleration of the vehicle with the gravitational acceleration component compensated. It is possible to reduce the number of expensive gyroscopes needed for a vehicle speed measuring apparatus, thereby reducing the cost of the apparatus.
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Citations
13 Claims
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1. A method for measuring the speed of a moving land vehicle using an accelerometer, which comprises:
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storing measurement data provided from an accelerometer;
analyzing the measurement data to determine whether the vehicle is stopped;
calculating a road angle using the measurement data of the accelerometer when it is determined, upon analysis, that the vehicle is moving;
determining the sign of the road angle when the road angle is greater than a threshold value;
compensating for a gravitational acceleration component included in the measurement data of the accelerometer using the road angle; and
calculating the speed of the vehicle based on the acceleration of the vehicle with the gravitational acceleration component compensated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for measuring the speed of a moving land vehicle using a biaxial accelerometer, comprising:
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an acceleration measuring section for measuring a current acceleration of the vehicle from the accelerometer mounted in the vehicle;
an acceleration storing section for storing information about accelerations measured by the acceleration measuring section on a measurement time basis;
a gravitational acceleration compensating section for analyzing measurement data provided from the accelerometer to determine whether the vehicle is stopped, calculating a road angle using the measurement data when it is determined that the vehicle is moving, determining the sign of the road angle when the road angle is greater than a threshold value, and compensating for a gravitational acceleration component included in the measurement data of the accelerometer using the road angle; and
a speed calculating section for calculating the speed of the vehicle based on a real acceleration of the vehicle received from the gravitational acceleration compensating section. - View Dependent Claims (10, 11, 12, 13)
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Specification