Acceleration detection device and mounting angle detection method
AssigneeDenso Corporation
InventorsCHAO CHEN, NAOKI YOSHIDA
Life of this patent
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Abstract
An acceleration detection device includes an acceleration sensor that has a first detection axis and a second detection axis orthogonal to each other such that a yaw mounting angle between a vehicle reference axis and a virtual line is ±15 degrees or less, an acquisition section that acquires an acceleration in a direction of the first detection axis and an acceleration in a direction of the second detection axis, and a mounting angle calculation section that calculates the yaw mounting angle from an angle calculation formula.
Claims6
An acceleration detection device mounted on a vehicle, the acceleration detection device comprising:
- an acceleration sensor that has at least a first detection axis and a second detection axis orthogonal to each other and is mounted on the vehicle such that a yaw mounting angle between a vehicle reference axis that is either a vehicle front-rear direction axis or a vehicle width direction axis and a virtual line set between the first detection axis and the second detection axis is ±15 degrees or less;
- an acquisition section that is configured to acquire, from the acceleration sensor, an acceleration in a direction of the first detection axis and an acceleration in a direction of the second detection axis in a state where acceleration in the vehicle width direction is generated in the vehicle and low acceleration or low deceleration is generated in the vehicle front-rear direction;
- and
- a mounting angle calculation section that is configured to calculate the yaw mounting angle from an angle calculation formula that calculates the yaw mounting angle from an acceleration in the direction of the first detection axis and an acceleration in the direction of the second detection axis and the acceleration in the direction of the first detection axis and the acceleration in the direction of the second detection axis detected by the acquisition section, the angle calculation formula being derived by assuming a state where acceleration in the vehicle width direction is generated in the vehicle and no acceleration is generated in the vehicle front-rear direction and by using a fact that a tan value of the yaw mounting angle is approximated to the yaw mounting angle.
A mounting angle detection method for detecting a mounting angle of an acceleration sensor that has at least a first detection axis and a second detection axis orthogonal to each other and is disposed on a vehicle such that a yaw mounting angle between a vehicle reference axis that is either a vehicle front-rear direction axis or a vehicle width direction axis and a virtual line set between the first detection axis and the second detection axis is ±15 degrees or less, the method comprising:
- acquiring, from the acceleration sensor, an acceleration in a direction of the first detection axis and an acceleration in a direction of the second detection axis in a state where acceleration in the vehicle width direction is generated in the vehicle and low acceleration or low deceleration is generated in the vehicle front-rear direction;
- and
- calculating the yaw mounting angle from an angle calculation formula that calculates the yaw mounting angle from an acceleration in the direction of the first detection axis and an acceleration in the direction of the second detection axis and the acceleration in the direction of the first detection axis and the acceleration in the direction of the second detection axis acquired, the angle calculation formula being derived by assuming a state where acceleration in the vehicle width direction is generated in the vehicle and no acceleration is generated in the vehicle front-rear direction and by using a fact that a tan value of the yaw mounting angle is approximated to the yaw mounting angle.
Dependencies are inferred from the claim text.