Method for correcting the outputs of vehicle behavior sensor
First Claim
1. A method for correcting outputs of a vehicle behavior sensor assembly of a vehicle control device including an electronic control unit, said vehicle behavior sensor assembly comprising a first acceleration sensor element for detecting an acceleration of a vehicle on which said vehicle control device is mounted in an X-axis direction in which the vehicle travels, and a second acceleration sensor element for detecting an acceleration of the vehicle in a Y-axis direction that is perpendicular to the X-axis direction, said electronic control unit being configured to control the behavior of the vehicle based on signals from said first and second acceleration sensor elements:
- said method comprising;
mounting said sensor assembly on the vehicle in a predetermined positional relationship relative to the vehicle;
keeping the vehicle in a stationary state with the X-axis and Y-axis directions horizontal;
feeding a signal indicating that the vehicle is horizontal to said electronic control unit;
detecting outputs from said first and second sensor elements, respectively, in response to said signal indicating that the vehicle is horizontal;
calculating first and second deviation angles of sensing directions of said first and second sensor elements about said X-axis direction in a YZ plane that is perpendicular to said X-axis direction and about said Y-axis direction in an XZ plane that is perpendicular to said Y-axis direction based on said outputs from said first and second sensor elements, respectively; and
correcting outputs of said first and second sensor elements based on said calculated first and second deviation angles and while the vehicle is traveling, wherein said sensor assembly is kept in said predetermined positional relationship relative to the vehicle during the correction of said outputs while the vehicle is traveling.
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Abstract
First and second acceleration sensor elements for detecting the acceleration of a vehicle in the direction in which the vehicle travels, and the acceleration of the vehicle in the direction transverse to the travel direction of the vehicle are mounted on a sensor substrate which is mounted on a control substrate of a vehicle control device. With the sensor substrate positioned such that the sensing directions of the respective sensor elements are perpendicular to or parallel to the vertical line, the outputs of the respective sensor elements are detected as zero errors or gain errors. The sensor substrate is then mounted on a vehicle and with the vehicle placed on a horizontal surface, a signal is sent to an electronic control unit (ECU) of the vehicle control device so that the ECU can recognize that the vehicle is horizontal. Based on the outputs from the first and second sensor elements at this time, the deviation angles of the sensor elements about the X-axis and Y-axis directions are calculated. The acceleration in the X-axis direction is calculated from signals from wheel speed sensors. Based on the deviation angles and the acceleration in the X-axis direction, the deviation angle of the sensor elements about the Z-axis is calculated. Based on the thus calculated deviation angles and zero errors and/or gain errors, the outputs of the sensor elements are corrected to obtain true accelerations in the X-axis and Y-axis directions.
55 Citations
12 Claims
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1. A method for correcting outputs of a vehicle behavior sensor assembly of a vehicle control device including an electronic control unit, said vehicle behavior sensor assembly comprising a first acceleration sensor element for detecting an acceleration of a vehicle on which said vehicle control device is mounted in an X-axis direction in which the vehicle travels, and a second acceleration sensor element for detecting an acceleration of the vehicle in a Y-axis direction that is perpendicular to the X-axis direction, said electronic control unit being configured to control the behavior of the vehicle based on signals from said first and second acceleration sensor elements:
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said method comprising; mounting said sensor assembly on the vehicle in a predetermined positional relationship relative to the vehicle; keeping the vehicle in a stationary state with the X-axis and Y-axis directions horizontal; feeding a signal indicating that the vehicle is horizontal to said electronic control unit; detecting outputs from said first and second sensor elements, respectively, in response to said signal indicating that the vehicle is horizontal; calculating first and second deviation angles of sensing directions of said first and second sensor elements about said X-axis direction in a YZ plane that is perpendicular to said X-axis direction and about said Y-axis direction in an XZ plane that is perpendicular to said Y-axis direction based on said outputs from said first and second sensor elements, respectively; and correcting outputs of said first and second sensor elements based on said calculated first and second deviation angles and while the vehicle is traveling, wherein said sensor assembly is kept in said predetermined positional relationship relative to the vehicle during the correction of said outputs while the vehicle is traveling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification