Abs Function

SYSTEM DIAGRAM

Fig 1: VDC/TCS/ABS System Diagram (TCS Function)

Courtesy of NISSAN NORTH AMERICA, INC.

• By preventing wheel lock through brake force (brake fluid pressure) control that is electronically controlled by detecting wheel speed during braking, stability during emergency braking is improved so that obstacles can be avoided by steering operation.
• During braking, control units calculate wheel speeds, and transmit pressure increase, hold or decrease signals to actuator portion according to wheel slip status.
• The following effects are obtained by preventing wheel lock during braking:
  Fig 2: Overview Of Improvement In Vehicle Stability Using ABS

  Courtesy of NISSAN NORTH AMERICA, INC.
  • Vehicle tail slip is prevented during braking when driving straight.
  • Understeer and oversteer tendencies are moderated during braking while cornering.
  • Obstacles may be easily bypassed by steering operation during braking.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in ABS function, the control is suspended for VDC function, TCS function and ABS function. However, EBD function operates normally. Refer to FAIL-SAFE .

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.