Nissan Leaf. Instruction — part 175
SYSTEM
BR-21
< SYSTEM DESCRIPTION >
C
D
E
G
H
I
J
K
L
M
A
B
BR
N
O
P
The stroke sensor detects the brake pedal stroke, and the motor inside the electrically-driven intelligent brake
unit presses the master cylinder piston, generating boost operation (brake pedal assist force) and increasing
the fluid pressure.
When Cooperative Regenerative Brake Control Is Operating
Motor
Piston
JSFIA1647ZZ
JSFIA1648ZZ
BR-22
< SYSTEM DESCRIPTION >
SYSTEM
When the amount of regenerative braking increases, the motor inside the electrically-driven intelligent brake
unit returns the master cylinder piston, lowering the fluid pressure. While the vehicle is stopped, because the
amount of regenerative braking decreases, the motor inside the electrically-driven intelligent brake unit
presses the master cylinder piston, increasing the fluid pressure.
When Control Is Stopped
The input rod crosses the cooperative regenerative brake control gap and contacts the master cylinder piston,
generating fluid pressure. There is no boost force (assist force), and the braking force is determined by the
force pressing on the brake pedal.
hill start assist FUNCTION
hill start assist FUNCTION : System Description
INFOID:0000000010122989
• This function maintains brake fluid pressure so that the vehicle does not move backwards even if brake
pedal is released to depress accelerator pedal to start the vehicle while it is stopped on an uphill slope by
depressing brake pedal.
• This function operates when the vehicle is in stop status on a uphill slope of slope ratio 10% or more and
selector lever is in the position other than P or N.
• hill start assist function is only for the start aid. It maintains the brake fluid pressure for approx. 2 seconds
after releasing the brake pedal, and then decreases the pressure gradually. If the vehicle can start by the
accelerator operation, the brake is released automatically and a smooth start can be performed.
• Fail-safe function is adopted. When a malfunction occurs in hill start assist function, the control is suspended
for hill start assist function. The vehicle status becomes the same as models without hill start assist function.
.
SYSTEM DIAGRAM
Motor
Piston
Motor
Piston
Input rod
JSFIA1649ZZ
SYSTEM
BR-23
< SYSTEM DESCRIPTION >
C
D
E
G
H
I
J
K
L
M
A
B
BR
N
O
P
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JSFIA2283GB
Component
Signal description
ABS actuator and electric unit (control unit)
Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN
communication and brake communication (CAN communication).
• ABS actuator and electric unit (control unit) control signal
• Vehicle speed signal (ABS)
• Decel G signal
• Front LH wheel speed signal
• Rear LH wheel speed signal
• Front RH wheel speed signal
• Rear RH wheel speed signal
• Yaw rate signal
• Side G signal
• VDC malfunction signal
• VDC OFF switch signal
• Master cylinder fluid pressure signal
Mainly receives the following signals from electrically-driven intelligent brake unit via CAN
communication and brake communication (CAN communication).
• Electrically-driven intelligent brake control signal
• Brake assist request signal
• Brake power supply backup operation signal
• Brake power supply backup operation request signal
• Brake warning lamp request signal
• Brake system warning lamp request signal
VCM
Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN
communication.
• VCM control signal
• Current regenerative torque signal
• VCM status signal
• Shift position signal
Mainly receives the following signal from electrically-driven intelligent brake unit via CAN
communication.
• Target braking force signal
BR-24
< SYSTEM DESCRIPTION >
SYSTEM
WARNING/INDICATOR/CHIME LIST
WARNING/INDICATOR/CHIME LIST : Warning Lamp/Indicator Lamp
INFOID:0000000010122990
FOR U.S.A.
FOR CANADA
WARNING/INDICATOR/CHIME LIST : Brake System Warning Lamp (Yellow)
INFOID:0000000010122991
DESIGN/PURPOSE
• The brake system warning lamp warns the driver of a malfunction in the electrically-driven intelligent brake
unit or the brake power supply backup unit.
- For U.S.A.
BCM
Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN
communication.
• Sleep wake up signal
• Power switch ON signal
• Door switch signal
Steering angle sensor
Mainly transmits the following signal to electrically-driven intelligent brake unit via CAN
communication.
• Steering angle sensor signal
Combination meter
Mainly receives the following signals from ABS actuator electric unit (control unit) via elec-
trically-driven intelligent brake unit via CAN communication.
• Brake warning lamp signal
• Brake system warning lamp signal
Component
Signal description
Name
Design
Layout/Function
Brake system warning lamp
(yellow)
For layout: Refer to
MWI-8, "METER SYSTEM : System Description"
For function: Refer to
BR-24, "WARNING/INDICATOR/CHIME LIST : Brake System
Brake warning lamp
(red)
For layout: Refer to
MWI-8, "METER SYSTEM : System Description"
For function: Refer to
BR-26, "WARNING/INDICATOR/CHIME LIST : Brake Warning
.
Name
Design
Layout/Function
Brake system warning lamp
(yellow)
For layout: Refer to
MWI-8, "METER SYSTEM : System Description"
For function: Refer to
BR-24, "WARNING/INDICATOR/CHIME LIST : Brake System
Brake warning lamp
(red)
For layout: Refer to
MWI-8, "METER SYSTEM : System Description"
For function: Refer to
BR-26, "WARNING/INDICATOR/CHIME LIST : Brake Warning
.
JPNIA1873ZZ
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