Nissan Leaf. Manual - part 507

EVC-52

< SYSTEM DESCRIPTION >

SYSTEM

Then, VCM determines the charge power based on the Li-ion battery chargeable power signal received from

the Li-ion battery controller and the chargeable power signal received from the PDM (Power Delivery Module).

VCM then sends the maximum charge power signal to the PDM (Power Delivery Module). 

The PDM (Power Delivery Module) determines a charge power based on the maximum charge power signal

and the maximum input current signal sent by the EVSE control box.

Concurrently, the VCM activates the system main relay 1 and system main relay 2. Consequently, Li-ion bat-

tery charge starts.

NOTE:

• Li-ion battery charge does not start when the power switch is ON. When it is required to charge with the

power switch ON, start charging before turning ON the power switch.

• When the charging connector is connected to the charge port in the READY state, READY is turned OFF,

the power switch is turned ON, and the shift position is changed to N position.

IMMEDIATE CHARGE MODE

When EVSE is connected to the normal charge port, the PDM (Power Delivery Module) transmits an EV sys-

tem activation signal to VCM. Li-ion battery charge then starts immediately.

When the timer charge is set, Li-ion battery charge does not start just after the PDM (Power Delivery Module)

transmits an EV system activation signal to VCM. When VCM detects an ON signal from the immediate charg-

ing switch in that state, VCM judges that the immediate charge mode is selected and starts charging.

When the charge is finished and VCM receives a Li-ion battery charge completion signal from Li-ion battery

controller, VCM stops the charge control.

TIMER CHARGE MODE

VCM starts up automatically and starts charging at the set time.

When VCM receives a Li-ion battery charge completion signal from Li-ion battery controller or at a set timer

charge finish time, VCM stops the charge control.

NOTE:

• The timer setting method varies according to vehicle specifications.

- Models with navigation system: Refer to 

AV-221, "MULTI AV SYSTEM : System Description"

 (Navigation

without BOSE) or 

AV-346, "MULTI AV SYSTEM : System Description"

 (Navigation with BOSE).

- Models without navigation system: Refer to 

MWI-30, "TIMER CHARGE AND A/C-HEATER TIMER (CLI-

MATE CTRL. TIMER) (WITHOUT NAVIGATION) : System Description"

.

• When timer charge and the timer air conditioner operate simultaneously, VCM distributes power to the air

conditioner system and the charge system according to the priority set on the navigation screen or combina-

tion meter.

REMOTE CHARGE MODE

When TCU transmits an EV system activation signal to VCM, VCM judges that the remote charge mode is

selected and starts charge control.

When VCM receives a Li-ion battery charge completion signal from Li-ion battery controller, VCM stops the

charge control.

CANCEL CONDITIONS

VCM stops the normal charging when VCM detects the EVSE is disconnected. 

In addition, under the following conditions, VCM temporarily stops the normal charging and enters standby

status.

• When the AC voltage and PWM communication from the EVSE are interrupted. 

• When the EVSE connector release switch is pressed. 

• When the Li-ion battery temperature reaches 60

°C (140°F) or higher.

SYSTEM

EVC-53

< SYSTEM DESCRIPTION >

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LI-ION BATTERY CHARGE CONTROL : Quick Charge Control

INFOID:0000000010120562

SYSTEM DIAGRAM

BASIC CONTROL

When the quick charge connector is connected to the quick charge port and the start switch of quick charger is

pressed, the PDM (Power Delivery Module) transmits an EV system activation request signal to VCM. VCM

then activates the F/S CHG relay.

Next, VCM determines the target charge power based on the Li-ion battery chargeable power signal received

from the Li-ion battery controller and the chargeable power signal received from the PDM (Power Delivery

Module). VCM then sends the maximum charge power signal to the PDM (Power Delivery Module). 

The PDM (Power Delivery Module) converts the Maximum charge power signal to a charge current request

signal and transmits it to the quick charger.

Simultaneously, the PDM (Power Delivery Module) activates the quick charge relay, and VCM activates sys-

tem main relay 1 and system main relay 2. Consequently, the quick charge starts.

When the charge amount reaches the prescribed amount and VCM receives the Li-ion battery charge comple-

tion signal from the Li-ion battery controller, VCM stops the charging. 

NOTE:

• Even if the Li-ion battery remaining energy does not reach the predetermined level, VCM may stop the

charge control after a certain period of time.

• When the Li-ion battery temperature reaches 60ºC (140

°F) or higher, VCM temporarily stops quick charging

and enters standby status.

HIGH VOLTAGE SYSTEM COOLING CONTROL
HIGH VOLTAGE SYSTEM COOLING CONTROL : System Description

INFOID:0000000010120563

VCM controls water pump and cooling fan according to information from various sensors and ECUs.

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EVC-54

< SYSTEM DESCRIPTION >

SYSTEM

SYSTEM DIAGRAM

WATER PUMP CONTROL

Control Description

VCM controls the electric water pump to achieve the flow rate corresponding to water temperature and vehicle

speed. The electric water pump contains an interface circuit. When a malfunction occurs in the pump, the elec-

tric water pump transmits an error signal to VCM and prevents the reduction in coolant flow rate. Since PDM

(Power Delivery Module) needs to be cooled during charge, VCM activates the electric water pump to circulate

coolant to PDM (Power Delivery Module).

Electric Water Pump Operation During Traveling

< Reference value of electric water pump duty>

NOTE:

The values listed above may slightly differ from actual measurement values depending on conditions.

Fail-Safe

When a malfunction occurs in the electric water pump, VCM controls the electric water pump as follows:

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Electric water pump operation

Electric water pump control duty 

(Approx.)

LOW

40%

MID

60%

HIGH

73%

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SYSTEM

EVC-55

< SYSTEM DESCRIPTION >

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COOLING FAN CONTROL

Control Description

VCM calculates an appropriate speed according to coolant temperature, vehicle speed, and a cooling fan

speed request signal received from A/C auto amplifier and transmits a duty signal to the cooling fan control

module.VCM judges a maximum fan speed according to a cooling fan speed (calculated from coolant temper-

ature and a vehicle speed) and that requested from the A/C auto amplifier and outputs drive duty.

NOTE:

The cooling fan may be activated during charge or deice system operation (only models with heat pump) even

when the power switch is OFF.

The cooling fan speed control reduces variations in cooling fan

speed by setting a range in operating conditions as shown in the fig-

ure.

VCM reduces the frequency of ON/OFF cycles by setting a period of

time (A) in which the cooling fan continuously operates after the A/C

compressor is turned OFF.

Cooling fan operation (During traveling or charging)

<With heat pump system>

Cooling fan duty (%)

<Without heat pump system>

Feedback to VCM

Control state

Malfunction in pump or abnormal power supply of 
pump

STOP

• Abnormal feedback signal
• A break in communication line or short circuit

Normal control
NOTE:
Water pump operates at a maximum velocity

Abnormal signal input from pump

Normal control

Speed fed back from pump differs largely from VCM-
indicated speed.

Normal control

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Engine coolant temper-

ature [

°C (°F)]

Vehicle speed [km/h (MPH)]

0 (0) – 20 (12)

20 (12) – 50 (31)

50 (31) – 80 (50)

80 (50) or more

60 (140) or less

0

0

0

0

60 (140) – 62 (144)

30 – 75

30 – 75

30 – 75

0

62 (144) or more

100

100

100

100