Process for compensating acceleration sensor errors
First Claim
1. A process for compensating errors of a vehicle acceleration sensor and determining if a vehicle acceleration sensor for the measurement of an acceleration in a defined direction of a vehicle is functioning, comprising the steps of using at least one of a sliding average method and a functional check method, wherein the sliding average method includes subjecting an output signal of the acceleration sensor to a sliding average when it is concluded from general driving conditions of the vehicle that the acceleration to be measured in the defined direction must momentarily be equal to zero to detect part of the output signal of the acceleration sensor based on an acceleration in a direction differing from the defined direction of the acceleration to be measured, generating a signal of the acceleration sensor from the output signal of the acceleration sensor by subtracting a result of the sliding average from the output signal of the acceleration sensor in order to arrive at the signal of the acceleration sensor representing the acceleration to be measured in the defined direction, using the generated signal in lieu of the output signal, and the functional check method includes conducting a functional check of the acceleration sensor by basing part of the output signal of the acceleration sensor on an acceleration in a direction which is the same as the measurement direction of at least one further device for the determination of the acceleration in an at-least-one-further-device-determined direction, the output signal of the acceleration sensor being compared with the determined value of the acceleration in the at-least-one-further-device-determined direction, and determining the existence of a functional fault of the acceleration sensor from a deviation when it is derived from general driving situations that only an acceleration in the at-least-one-further-device-determined direction acts on the acceleration sensor.
0 Assignments
0 Petitions
Accused Products
Abstract
A process for compensating systematic errors of an acceleration sensor. The result of a sliding average of the output of the accelerometer, determined when acceleration in the primary measurement direction is zero, is subtracted from the output of the accelerometer thus producing a signal representative of acceleration only in the primary direction. A functional check of the accelerometer is provided by aligning the accelerometer in a second direction and comparing the acceleration measured in this second direction to the acceleration measured in the primary direction by a second device for determining acceleration and indicating a malfunction when the two measured accelerations are different and it is determined that acceleration only in the primary direction is present.
42 Citations
44 Claims
- 1. A process for compensating errors of a vehicle acceleration sensor and determining if a vehicle acceleration sensor for the measurement of an acceleration in a defined direction of a vehicle is functioning, comprising the steps of using at least one of a sliding average method and a functional check method, wherein the sliding average method includes subjecting an output signal of the acceleration sensor to a sliding average when it is concluded from general driving conditions of the vehicle that the acceleration to be measured in the defined direction must momentarily be equal to zero to detect part of the output signal of the acceleration sensor based on an acceleration in a direction differing from the defined direction of the acceleration to be measured, generating a signal of the acceleration sensor from the output signal of the acceleration sensor by subtracting a result of the sliding average from the output signal of the acceleration sensor in order to arrive at the signal of the acceleration sensor representing the acceleration to be measured in the defined direction, using the generated signal in lieu of the output signal, and the functional check method includes conducting a functional check of the acceleration sensor by basing part of the output signal of the acceleration sensor on an acceleration in a direction which is the same as the measurement direction of at least one further device for the determination of the acceleration in an at-least-one-further-device-determined direction, the output signal of the acceleration sensor being compared with the determined value of the acceleration in the at-least-one-further-device-determined direction, and determining the existence of a functional fault of the acceleration sensor from a deviation when it is derived from general driving situations that only an acceleration in the at-least-one-further-device-determined direction acts on the acceleration sensor.
Specification