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Yaw-Rate Sensor is a gyroscopic device that calculates a vehicle's yaw rate. The yaw rate is the angular velocity around its vertical axis. The angle between the vehicle's heading and speed is called the slip angle related to the yaw rate.

  • The computer receives these inputs and then signals the proper servo valve. It sends high-pressure hydraulic fluid through a computer-controlled valve in the actuator. The actuator raises or lowers the wheel so the tire maintains the same force against the road., which maintains the vehicle level while providing the best possible ride and handling.

The piezoelectric type of yaw rate sensor is like a tuning fork-shaped structure wherein when the slip angle is zero, the upper elements do not produce a voltage as no one acts on them. But during a cornering condition, a rotational movement will cause the upper part of the tuning fork to leave the oscillatory plane and create an alternating voltage. This will create an alternating voltage proportional to the yaw rate and oscillatory speed. The output signal's sign depends on the rotation direction. 

For the micromechanical type, a micromechanical capacitive acceleration sensor is mounted on the oscillatory element, which causes proportional acceleration to the product of the yaw rate and oscillatory velocity, with a maintained electronically constant value.