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Greenline Motorsports - GRID Digital IMU Sensor Information
GRID Digital IMU Sensor Information

The GTR's standard G sensor is an analog type sensor developed nearly 30 years ago.
The G sensor (acceleration based sensor) outputs according to acceleration and deceleration and left and right G (acceleration). Particularly in the ATESSA system in the early R32 GTR, accuracy was limited due to slow reaction rate and vibration, because acceleration was measured by measuring the amount of swing of a metal pendulum immersed in oil.
Due this initial delay in reaction of the sensor, there is a significant lag before front torque is delivered through the 4WD system at corner exit.

Using the latest MEMS (Micro Electro Mechanical Systems) sensor (integrated on a silicon substrate by microfabrication technology), this digital sensor achieves real time response with high accuracy.



The new "digital IMU sensor" is a gyro sensor that detects yaw, front and rear pitch, right and left rolls, and drift to make up for the slow reaction when only measuring G, and lateral G from the G sensor alone. Combined, the IMU sensor measures 6 DoF (6 degrees of freedom).



Normally used in aircraft and newer vehicles, the IMU detects changes in the posture of moving objects.
For example, when starting from a stand still, the tail of the vehicle will sink, before the vehicle actually moves. This IMU gyro can detect the change in pitch of the vehicle before the G sensor can.
In cornering it is also possible to detect the change of the left and right "roll" of the vehicle body, the "yaw" as the vehicle body changes direction, and the "drift state" of the sideslip.

With the gyro sensor alone, it is not possible to measure the acceleration (G).
By using conventional G sensor and this IMU gyroscope (to detect movement of the car body), changes in the vehicle posture are detected in real-time, with high-precision, allowing for 4WD ATESSA control not possible in the past.

  • Quicker transition to 4WD when acceleration begins
  • Transition to and maintaining earlier 4WD during hard braking
  • Faster front torque change delivery following the roll caused by steering inputs
  • Changing to 4WD by detecting drift state
  • Better 4WD control following transitions from acceleration to deceleration
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