Inclinometer Using Acceleration
First Claim
Patent Images
1. An inclinometer, comprising:
- a yaw compensator configured to use an accelerometer position offset in a forward direction with respect to a rear axle and a yaw angle rate to determine a position offset error; and
an incline angle calculator configured to use said position offset error, a forward acceleration measurement, and a forward speed to calculate a forward incline angle.
0 Assignments
0 Petitions
Accused Products
Abstract
An inclinometer using speed, acceleration and yaw angle rate to measure inclination angle. The accuracy of the inclination angle measurement may be improved by compensating for a position offset of an accelerometer; Kalman filtering with an external altitude measurement; and/or compensating for an accelerometer bias. The accelerometer bias may be calculated based on a last incline angle before a dormant time period and/or by Kalman filtering.
46 Citations
20 Claims
-
1. An inclinometer, comprising:
-
a yaw compensator configured to use an accelerometer position offset in a forward direction with respect to a rear axle and a yaw angle rate to determine a position offset error; and an incline angle calculator configured to use said position offset error, a forward acceleration measurement, and a forward speed to calculate a forward incline angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An inclinometer, comprising:
-
a restart bias detector to estimate an accelerometer bias at a restart of motion after a dormant time period, said estimate based on a last incline angle before said dormant time period; and an incline angle calculator configured to use an acceleration measurement, said accelerometer bias, and a forward speed for calculating a succeeding incline angle. - View Dependent Claims (10)
-
-
11. A method for calculating an incline angle, comprising:
-
determining a position offset error based on an accelerometer position offset in a forward direction with respect to a rear axle and a yaw angle rate; and calculating a forward incline angle based on said position offset error, a forward acceleration measurement, and a forward speed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for calculating an incline angle, comprising:
-
estimating an accelerometer bias at a restart of motion after a dormant time period, said estimating based on a last incline angle before said dormant time period; and calculating a succeeding incline angle based on an acceleration measurement, said accelerometer bias, and a forward speed. - View Dependent Claims (20)
-
Specification