VDC FUNCTION: System Description: Notes

Side slip or tail slip may occur while driving on a slippery road or intending an urgent evasive driving. VDC function detects side slip status using each sensor when side slip or tail slip is about to occur and improves vehicle stability by brake control and motor torque control during driving.
In addition to ABS function, EBD function and TCS function, target side slip amount is calculated according to steering operation amount from steering angle sensor. By comparing this information with vehicle side slip amount that is calculated from information from yaw rate/side/decel G sensor and wheel sensor, vehicle driving conditions (conditions of understeer or oversteer) are judged and vehicle stability is improved by brake force control on all 4 wheels and motor torque control.

Fig 1: Schematic Diagram Of VDC Control
Courtesy of NISSAN NORTH AMERICA, INC.
VDC function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case, VDC OFF indicator lamp turns ON.
Control unit portion automatically improves driving stability by performing brake force control as well as motor torque control, by transmitting drive signal to actuator portion according to difference between target side slip amount and vehicle side slip amount
VDC warning lamp blinks while VDC function is in operation and indicates to the driver that the function is in operation.
CONSULT can be used to diagnose the system diagnosis.
Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC function, TCS function, brake limited slip differential (BLSD) function and brake assist function. The vehicle status becomes the same as models without VDC function, TCS function, brake limited slip differential (BLSD) function and brake assist function. However, ABS function and EBD function are operated normally. Refer to "FAIL-SAFE ".

NOTE: VDC has the characteristic as described here, This is not the device that helps reckless driving.