Nissan Versa Note. Instruction — part 114
BRC-20
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
CONDITIONS FOR INDICATOR LAMP ILLUMINATION
• Turns ON when VDC and TCS functions are switched to non-operational status (OFF) by VDC OFF switch.
• Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
CONDITIONS FOR WARNING LAMP ILLUMINATION
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
Component
Function
Pump
Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1
Cut valve 2
Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2
Supplies the brake fluid from master cylinder to the pump.
ABS IN valve
Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve
Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve
Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice
of each valve when brake is released.
Reservoir
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreas-
es when decreasing pressure of brake caliper and wheel cylinder.
Pressure sensor
Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Condition (status)
VDC OFF indicator lamp
SLIP indicator lamp
Ignition switch OFF
OFF
OFF
For approx. 1 second after the ignition switch
is turned ON
ON
ON
Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration)
OFF
OFF
When VDC OFF switch is ON (VDC function
and TCS function are OFF)
ON
OFF
VDC function is malfunctioning
OFF
ON
TCS function is malfunctioning
OFF
ON
Condition (status)
ABS warning lamp
Brake warning lamp
Ignition switch OFF
OFF
OFF
For approx. 1 second after the ignition switch
is turned ON
ON
ON
Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration)
OFF
OFF
After engine starts
OFF
OFF
When parking brake operates (parking brake
switch ON)
OFF
ON
When brake fluid is less than the specified
level (brake fluid level switch ON)
OFF
ON
VDC function is malfunctioning
OFF
OFF
TCS function is malfunctioning
OFF
OFF
ABS function is malfunctioning
ON
OFF
EBD function is malfunctioning
ON
ON
Brake limited slip differential (BLSD) function
is malfunctioning
OFF
OFF
SYSTEM
BRC-21
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VDC/TCS/ABS : VDC Function
INFOID:0000000009364890
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
• Side slip or tail slip may occur while driving on a slippery road or intending an urgent evasive driving maneu-
ver. 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 engine output 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 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 engine output control.
• 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
engine output control, by transmitting drive signal to actuator portion according to difference between target
side slip amount and vehicle side slip amount
VDC function is operating
OFF
OFF
TCS function is operating
OFF
OFF
Condition (status)
ABS warning lamp
Brake warning lamp
AWFIA0807GB
JSFIA0672GB
BRC-22
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
• Brake force control function at braking hard detects driver
′s brake operations with the pressure sensor,
judges a brake booster
′s maximum brake power function by using information from the vacuum sensor, and
enhances more powerful braking force by controlling brakes of four wheels.
• 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.
• Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC
function and TCS function. However, ABS function and EBD function operate normally. Refer to
.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
OPERATION CHARACTERISTICS
VDC Function That Prevents Oversteer Tendency
• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the outer
side of turn. Momentum is generated directing the vehicle toward the outer side of the turn. Oversteer is pre-
vented.
• Changing driving lane on a slippery road, when there may be a tendency to oversteer, engine output is con-
trolled as well as brake force (brake fluid pressure) of 4 wheels. Oversteer tendency decreases.
Component
Signal description
ECM
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Acceleration pedal position signal
• Engine speed signal
• Target throttle position signal
TCM
Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.
Steering angle sensor
Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
ALFIA0339GB
ALFIA0340GB
SYSTEM
BRC-23
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VDC Function That Prevents Understeer Tendency
• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the inner
side of turn. Momentum is generated directing the vehicle toward the inner side of the turn. Understeer is
prevented.
• Applying brakes during cornering on a slippery road, when there may be a tendency to understeer, engine
output is controlled as well as brake force (brake fluid pressure) of 4 wheels. Understeer tendency
decreases.
VDC/TCS/ABS : TCS Function
INFOID:0000000009364891
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
JPFIC0137GB
ALFIA0341GB
AWFIA0807GB
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст