Application examples in active suspension system [6in1 Sensor]

Utilization points of 6in1 sensor in active suspension vibration control

  • By detecting vibrations and tilts from the road, the system controls the strength of the suspension to maintain passenger comfort. (Accel. X, Y, Z)
  • When driving on a curve, the control system adjusts individual suspensions to stabilize the driver's seat and each seat. (Gyro X, Y, Z, Accel. X, Y, Z)
  • Conforms to ASIL-B(D) and 8kHz sampling frequency, outputs stable signal even in high temperature environment or high vibration of commercial vehicle, contributing to high-speed operation of system

What are the positives to use 6in1 sensor for active suspension?

1 : Maintains cabin comfort by detecting vibrations from the road surface and vehicle tilt

The accelerometer and gyroscope (angular velocity sensor) mounted on the suspension detects vibrations caused by road gaps and friction, and detects the tilt and centrifugal force of the vehicle when cornering, and the 6in1 sensor installed in the ECU. By comparing the calculated acceleration and angular velocity and changing the hardness for each suspension, it is possible to maintain passenger comfort.

[What's good in 6in1?]

  • Possible to calculate the vehicle attitude in 3D from the data of Panasonic's 6in1 sensor (3-axis accelerometer, 3-axis gyroscope), and the occupant detection results by other sensors can also be combined to fix each suspension independently, and system can control the height and maintain the stability of the cabin.
  • Thanks to good vibration characteristics of the 6in1 sensor, accurate acceleration and angular velocity data can be obtained and used for suspension control even in a environment with vibration and inclination on unpaved roads, commercial vehicles, special vehicles, etc.

2 : Also possible to supplement the camera-based active suspension system.

Even in the system that controls the suspension based on the recognition of the swell/tilt of the road, which is mainly the camera, the acceleration/angular velocity measured by the 6in1 sensor and the camera information are compared and verified in synchronization with the processing of the camera image. With, it is possible to correct the suspension control more accurately.

[What's good in 6in1?]

  • The high data output rate of 8kHz enables the system to detect vehicle movement and attitude, and continuously assist dynamic changes such as stabilizing the cabin attitude and suspension rigidity.
  • Stable transmission of acceleration/angular velocity detection data to a system that is easily exposed to high temperature and high vibration environments such as around tire houses

3 : Achieves both 6-axis detection and functional safety

Functional safety (ISO26262) is required for active suspension systems, and functional safety requirements equivalent to ASIL-B have begun for devices such as inertial sensors used in active suspension systems.
Panasonic's 6in1 sensor is equipped with a diagnostic function for all 6 axes of the 3-axis acceleration sensor and 3-axis gyro sensor mounted in the 1-chip MEMS, and the sensor 1 chip complies with ASIL-B(D). Therefore, by mounting one 6in1 sensor, it is possible to achieve both 6-axis detection and functional safety in a system that requires 6-axis inertial sensor and functional safety compliance without mounting multiple inertial sensors.

[What's good in 6in1?]

  • By mounting a 6in1 sensor that is compatible with ASIL-B(D) and 6-axis detection, both 6-axis detection and functional safety compliance can be achieved with one chip.
    In addition, it is possible to comply with functional safety with a single chip, eliminating the need to mount multiple sensors and reducing the BOM cost more than before.

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