Nissan Leaf. Manual — part 506
EVC-48
< SYSTEM DESCRIPTION >
SYSTEM
the signal, VCM activates the system main relay 1 and deactivates the pre-charge relay. Then, normal power
is supplied to the respective systems.
MOTOR POWER CONTROL
MOTOR POWER CONTROL : System Description
INFOID:0000000010120557
SYSTEM DIAGRAM
NOTE:
VCM calculates vehicle speed, based on a motor speed.
DESCRIPTION
The EV system generates traction force by converting the direct current from the Li-ion battery to an alternat-
ing current by the traction motor inverter and operating the traction motor with the alternating current.
VCM calculates target traction force, based on an accelerator pedal position, vehicle speed, and shift position.
After this, VCM adds creep force to the calculated target traction force.
Subsequently, VCM adds torque limitations to the calculated driving force, based on torque down signals
received from each system, to decide a motor torque request signal.
This motor torque request signal is transmitted to the traction motor inverter via EV system CAN communica-
tion.
For the operation principle of the motor, refer to
TMS-19, "MOTOR POWER CONTROL : Operating Principle"
.
OUTPUT LIMIT AND OUTPUT STOP REQUEST LIST
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EVC-49
< SYSTEM DESCRIPTION >
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MOTOR REGENERATION CONTROL
MOTOR REGENERATION CONTROL : System Description
INFOID:0000000010120558
SYSTEM DIAGRAM
NOTE:
VCM calculates vehicle speed, based on a motor speed.
DESCRIPTION
The regenerative brake system is a function that operates the traction motor as a generator during decelera-
tion, not for generating traction force as in normal driving, and converts the kinetic energy from the vehicle
wheels to electric energy that is used to charge the Li-ion battery. At the same time, it utilizes the rotational
resistance from the power generation as a part of the braking force.
For the operation principle, refer to
TMS-20, "MOTOR REGENERATION CONTROL : Operating Principle"
REGENERATIVE BRAKE CONTROL
When the driver depresses the brake pedal during driving, Electrically-driven Intelligent Brake Unit transmits a
target braking force signal to VCM. VCM calculates a target regenerative torque based on the signal and
Request ECU
Output limit cause
Power limitation indicator
lamp
Condition
Traction Motor In-
verter
Traction motor tempera-
ture high
ON
When the traction motor or traction motor inverter reaches
an abnormally high temperature
Input power low
ON
When the high voltage power input to the traction motor in-
verter is 240 V or less
DTC detected
OFF
Refer to
Li-ion battery
controller
Li-ion battery remained
energy low
ON
When the Li-ion battery cell voltage is low
Li-ion battery tempera-
ture high
ON
When the Li-ion battery reaches an abnormally high tem-
perature
[Reference value: Approx. 55
°C (131°F) or more]
Li-ion battery tempera-
ture low
ON
When the Li-ion battery reaches an abnormally low temper-
ature.
[Reference value: Approx.
−10°C (14°F) or less]
DTC detected
OFF
Refer to
.
VCM
Acceleration/brake signal
plausibility error
OFF
When the accelerator pedal position sensor signal and stop
lamp switch signal are input at the same time
Power train system pro-
tection function
OFF
—
DTC detected
OFF
Refer to
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EVC-50
< SYSTEM DESCRIPTION >
SYSTEM
transmits a target motor torque signal to the traction motor inverter. Moreover, VCM transmits the current
regenerative torque signal to Electrically-driven Intelligent Brake Unit so that the Electrically-driven Intelligent
Brake Unit can control the overall braking force.
For information on the Electrically-driven Intelligent Brake collaborative control, refer to
TIVE REGENERATIVE BRAKE FUNCTION : System Description"
.
REGENERATION CHARGE CONTROL
VCM determines the regenerative charging amount from the Li-ion battery maximum chargeable power signal
sent from the Li-ion battery. Moreover, VCM determines the energy recovery amount while performing a col-
laborative control with the electrically-driven intelligent brake system so that a suitable braking force is pro-
vided according to the brake pedal operation amount.
After determining the energy recovery amount, VCM transmits a target motor torque signal to the traction
motor inverter and starts regeneration charge.
If the Li-ion battery remaining energy is sufficient, VCM stops the regeneration charge control.
NOTICE:
VCM performs the regenerative charge control constantly at deceleration. However, when the Li-ion battery is
in the fully charged state, VCM stops the regenerative charge control. Accordingly, deceleration may be felt
weak when the accelerator pedal is released during driving.
ECO MODE/B MODE SYSTEM
ECO MODE/B MODE SYSTEM : System Description
INFOID:0000000010120559
SYSTEM DIAGRAM
*1: With steering switch
*2: Without steering switch
DESCRIPTION
ECO mode and B mode provide support for reducing the electricity consumption in actual traffic by reducing
power consumption of the drive motor and air conditioner and by increasing the regenerative power from the
drive motor.
NOTE:
ECO mode and B mode performs the control according to the normal characteristics when in reverse range.
ECO MODE
When the driver selects ECO mode by operating the shift lever (without steering switch models) or the ECO
mode switch (with steering switch models), VCM controls to a gentle acceleration (compared to normal mode)
and reduces electricity consumption by reducing waste in acceleration and deceleration. In addition, VCM
transmits an ECO mode request signal to the A/C auto amp. and reduces the electricity consumption of A/C
compressor by turning down the air conditioner.
VCM transmits an ECO mode indication request signal to the combination meter via CAN communication to
turn ON the ECO mode indicator lamp.
B MODE (REGENERATIVE BRAKE MODE)
When the driver selects B mode by operating the shift lever, VCM controls to a strong regeneration (compared
to normal mode) and collects more energy.
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< SYSTEM DESCRIPTION >
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LIST OF DRIVE FORCE CHARACTERISTICS BY MODE
LI-ION BATTERY CHARGE CONTROL
LI-ION BATTERY CHARGE CONTROL : System Description
INFOID:0000000010120560
CONTROL OUTLINE
VCM activates the EV system by connecting the charging connector, performing remote control, or using the
built-in timer to start charging to the Li-ion battery. The following charge modes are available.
LI-ION BATTERY CHARGE CONTROL : Normal Charge Control
INFOID:0000000010120561
SYSTEM DIAGRAM
BASIC CONTROL
When EVSE is connected under the power switch OFF condition, VCM judges that the system is in a charge
mode and activates the F/S relay and M/C relay to allow charging operation.
Mode
Power output
Regeneration
Normal
Normal control
Normal control
ECO mode
Gentle acceleration
Strongish
B mode
Normal control
Strong
B mode + ECO mode
Gentle acceleration
Strong
Methods of charging
Description
Normal charge
Immediate charge
VC-17, "LI-ION BATTERY CHARGE CONTROL : System Description"
Timer charge
Remote charge
Quick charge
Regeneration charge
EVC-49, "MOTOR REGENERATION CONTROL : System Description"
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