Nissan Leaf. Manual - part 174

SYSTEM

BR-17

< SYSTEM DESCRIPTION >

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C1A65

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1A67

Normal control

C1A69

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1A6B

The following function is suspended.
• Backup power supply from the brake power supply backup unit

C1A6C

C1A6D

C1A6E

The following function is suspended.
• Cooperative regenerative brake control
• hill start assist function

C1A6F

The following function is suspended.
• hill start assist function

C1A70

The following function is suspended.
• Cooperative regenerative brake control
• hill start assist function

C1A74

C1A80

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1A81

C1A82

C1A83

C1A84

C1A85

C1A86

C1A87

C1A88

C1A89

C1A8A

C1A8B

C1A90

C1A91

The following function is suspended.
• Cooperative regenerative brake control
• hill start assist function

C1A98

The following function is suspended.
• Power supply from the brake power supply backup unit

C1A99

C1A9A

C1AA0

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1AA1

C1AA2

C1AA3

C1AA9

The following function is suspended.
• Cooperative regenerative brake control
• hill start assist function

C1AB8

C1AB9

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1ABA

DTC

Vehicle condition

BR-18

< SYSTEM DESCRIPTION >

SYSTEM

COOPERATIVE REGENERATIVE BRAKE FUNCTION
COOPERATIVE REGENERATIVE BRAKE FUNCTION : System Description

INFOID:0000000010122988

COOPERATIVE REGENERATIVE BRAKE CONTROL

• A regenerative brake drives the traction motor to act as an alternator, and converts the kinetic energy pro-

duced by rotation of the tires into electrical energy. The converted electrical energy charges the Li-ion bat-

tery.

• When the brakes are operated (during driving), the electrically-driven intelligent brake unit calculates the

required braking force based on the input value from the stroke sensor (indicating the amount of brake pedal

operation), and it sends the result to the VCM. At the same time, it calculates the hydraulic braking force

needed to produce the required braking force.

• The VCM calculates the regenerative braking force needed to produce the required braking force, and sends

the result to the electrically-driven intelligent brake unit. At the same time, the traction motor inverter uses

the traction motor to perform regenerative braking.

• The electrically-driven intelligent brake unit calculates the hydraulic braking force again based on the regen-

erative braking force result from the VCM and the calculated result for hydraulic braking force.

C1AC0

The following function is suspended.
• Cooperative regenerative brake control

C1AC1

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake

C1AC8

Normal control

C1AD0

U1000

The following function is suspended.
• Cooperative regenerative brake control
• hill start assist function

U1010

U1510

U1511

The following functions are suspended.
• Power supply from the brake power supply backup unit

DTC

Vehicle condition

JSFIA1832GB

SYSTEM

BR-19

< SYSTEM DESCRIPTION >

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• Based on the calculated result for hydraulic braking force, the electrically-driven intelligent brake unit uses

the motor inside the electrically-driven intelligent brake unit to move the master cylinder piston, adjusting the

fluid pressure inside the master cylinder to the master fluid pressure. It also performs adjustment so that the

fluid pressure that is actually applied matches the target fluid pressure.

NOTE:

The fluid pressure applied to the master cylinder is detected by master cylinder pressure sensor and trans-

mits the electrically-driven intelligent brake unit from ABS actuator and electric unit (control unit) via brake

communication (CAN communication).

• The fluid pressure generated by the master cylinder is sent to each brake caliper via the ABS actuator and

electric unit (control unit).

• When the cooperative regenerative brake is operating, the motor inside the electrically-driven intelligent

brake unit moves the master cylinder piston according to the amount of regeneration.

• Moving the master cylinder piston increases the fluid pressure applied to the ABS actuator and electric unit

(control unit). (The brake pedal stroke does not change.)

• When brake control is stopped (immediately before vehicle stop or while vehicle is stopped), cooperative

regenerative brake control is not performed.

SYSTEM DIAGRAM 

INPUT SIGNAL AND OUTPUT SIGNAL 

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

JSFIA2283GB

BR-20

< SYSTEM DESCRIPTION >

SYSTEM

OPERATION

During Normal Braking

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

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