Nissan Leaf. Manual — part 310
BRC-30
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
*1: Communication line between yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit)
*2: CAN communication line between electrically-driven intelligent brake unit and ABS actuator and electric
unit (control unit)
OPERATION CHARACTERISTICS
VDC Function That Prevents Oversteer Tendency
• During a cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the outer
side of turn. Momentum directing towards the outer side of turn is generated. Oversteer is prevented.
• Changing driving lane on a slippery road, when oversteer tendency is judged large, motor torque is con-
trolled as well as brake force (brake fluid pressure) of 4 wheels. Oversteer tendency decreases.
VDC Function That Prevents Understeer Tendency
• During a cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the inner
side of turn. Momentum directing towards the inner side of turn is generated. Understeer is prevented.
• Applying braking during a cornering on a slippery road, when understeer tendency is judged large, motor
torque is controlled as well as brake force (brake fluid pressure) of four wheels. Understeer tendency
decreases.
TCS FUNCTION
ALFIA0339GB
ALFIA0340GB
JPFIC0137GB
ALFIA0341GB
SYSTEM
BRC-31
< SYSTEM DESCRIPTION >
[WITH VDC]
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TCS FUNCTION : System Description
INFOID:0000000010120033
• Wheel spin status of drive wheel is detected by wheel sensor of 4
wheels. Motor torque is controlled so that slip rate of drive wheels
is in appropriate level. When wheel spin occurs on drive wheel,
ABS actuator and electric unit (control unit) perform brake force
control of LH and RH drive wheels (apply brake force by increasing
brake fluid pressure of drive wheel) and decrease motor torque by
motor torque control. Wheel spin amount decreases. Motor torque
is controlled to appropriate level.
• TCS function can be switched to non-operational status (OFF) by
operating VDC OFF switch. In this case, VDC OFF indicator lamp
turns ON.
• VDC warning lamp blinks while TCS 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 TCS 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.
.
SYSTEM DIAGRAM
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JSFIA0781GB
JSFIA2065GB
BRC-32
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
*1: Communication line between yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit)
*2: CAN communication line between electrically-driven intelligent brake unit and ABS actuator and electric
unit (control unit)
ABS FUNCTION
ABS FUNCTION : System Description
INFOID:0000000010120034
• 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 easily bypassed by steering operation.
• During braking, control units calculates wheel speed and pseudo-vehicle speed, and transmits pressure
increase, hold or decrease signals to actuator portion according to wheel slip status.
Component
Signal description
Yaw rate/side/decel G sensor
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via com-
munication line
*1:
• Yaw rate signal
• Side G sensor signal
• Decel G sensor signal
VCM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication:
• Accelerator pedal position signal
• VCM control signal
• Shift position signal
Electrically-driven intelligent brake
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication line
*2
:
• Electrically-driven intelligent brake control signal
• Brake warning lamp request signal
• Brake system warning lamp request signal
Steering angle sensor
Mainly transmits the following signal to ABS actuator and electric unit (control unit) via CAN
communication:
• Steering angle sensor signal
Combination meter
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication:
• Brake fluid level switch signal
• Parking brake switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication:
• ABS warning lamp signal
• VDC warning lamp signal
• Brake warning lamp signal
• Brake system warning lamp signal
• VDC OFF indicator lamp signal
SYSTEM
BRC-33
< SYSTEM DESCRIPTION >
[WITH VDC]
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• The following effects are obtained by preventing wheel lock during
braking:
- Vehicle tail slip is prevented during braking when driving straight.
- Understeer and oversteer tendencies are moderated during brak-
ing driving on a corner.
- Obstacles may be easily bypassed by steering operation during
braking.
• CONSULT can be used to diagnose the system diagnosis.
• Fail-safe function is adopted. When a malfunction occurs in ABS
function, the control is suspended for VDC function, TCS function,
ABS function, brake limited slip differential (BLSD) function and
brake assist function. The vehicle status becomes the same as
models without VDC function, TCS function, ABS function, brake
limited slip differential (BLSD) function and brake assist function.
However, EBD function is operated normally. Refer to
.
NOTE:
• ABS has the characteristic as described here, but it is not the
device that helps reckless driving.
• To stop vehicle efficiently, ABS does not operate and ordinary
brake operates at low speed [approx. 10 km/h (6.2 MPH) or less,
but differs subject to road conditions).
• Self-diagnosis is performed immediately after when motor starts
and when vehicle initially is driven [by vehicle speed approx. 15
km/h (9.3 MPH)]. Motor sounds are generated during self-diagnosis. In addition, brake pedal may be felt
heavy when depressing brake pedal lightly. These symptoms are not malfunctions.
SYSTEM DIAGRAM
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JPFIC0140GB
JPFIC0144GB
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