Yaw-Rate Sensor

Application 

Detect the yawing motion of the vehicle, triggering an ESC control intervention if the yaw velocity reaches round about 4°/s (=full circle in 90 s).

Design and function 

The yaw-rate sensor relies on the action of microscopic tuning forks.

The plane in which these forks vibrate shifts when the car turns about its vertical axis. This shift is evaluated electronically.

Failsafe 

• A faulty yaw rate sensor produces an output signal of 0V.

Installation position 

• Tuning forks vertical.
• Required accuracy of position: max. 3° tolerance to maintain full comfort.
• Failure to maintain the specified installation position will result in asymmetrical control.

1. Specification
   STANDARD VALUE REFERENCE
   
   

   Item	Standard value	Remark
   Supply voltage	8V ~ 16V
   Supply current	Below 250mA
   Output voltage (at stop)	2.5V
   Output range	0.475 ~ 4.525V	Sensitivity = 27mV/deg/s
   Operating speed (at start)	4°/s
   Angular velocity detection range	-75 ~ 75deg/sec
   Operating temp.	-40 ~ 85°C

2. Output voltage
   Fig 1: Yaw-Rate Output Characteristic Voltage Graph

   Courtesy of KIA MOTORS AMERICA, INC.
3. Circuit Diagram

Fig 2: Yaw-Rate And Lateral Acceleration Sensor Circuit Diagram

Courtesy of KIA MOTORS AMERICA, INC.