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Nissan Leaf. Manual - part 808

SYSTEM

HAC-235

< SYSTEM DESCRIPTION >

[AUTO A/C (WITHOUT HEAT PUMP)]

HAC

AIR DISTRIBUTION

AUTOMATIC AIR CONDITIONING SYSTEM : PTC Heater Control

INFOID:0000000010121949

DESCRIPTION

• Based on the air mix door position and signals input from each sensor, the A/C auto amp. calculates the

PTC heater outlet air temperature.

• A/C auto amp. calculates the PTC heater operating rate so that the calculated PTC heater outlet air temper-

ature is achieved, and transmits the PTC heater operating rate request signal to the PTC heater via LIN

communication.

• Based on the A/C auto amplifier command, the control circuit inside the PTC heater controls the PTC heater

output by the PWM method.

NOTE:

MODE switch

VENT

—

B/L

FOOT

D/F

DEF switch

Intake switch

REC

—

FRE

Temperature control
switch

Full cold

16.0

°C

—

16.5

°C – 29.5°C

AUTO

Full hot

30.0

°C

ON/OFF switch

OFF

Fixed at the position where the ON/

OFF switch is pressed

—

Switch position

Door position

Mode door

Air mix door

Cen

ter ve

ila

r do

Sub

- de

ost

er do

til

ot doo

r a

ir m

Lowe

r a

ir m

Discharge air flow

MODE/DEF setting

potion

Air outlet/distribution (Approx.)

Ventilator

Foot

Defroster

Center

Side

Front

Rear

50%

—

30%

28%

12%

—

15%

45%

20%

—

15%

32%

13%

40%

—

15%

—

85%

HAC-236

< SYSTEM DESCRIPTION >

[AUTO A/C (WITHOUT HEAT PUMP)]

SYSTEM

If the difference between setting temperature and in-vehicle temperature is large and the A/C heater load is

high when the HEAT is ON (HEAT switch indicator lamp: ON) and A/C is OFF (A/C switch indicator lamp:

OFF), the heater control mode of the refrigerant cycle also operates. In addition, if the difference between set-

ting temperature and in-vehicle temperature is small and the A/C heater load is low, the PTC heater does not

operate. (Outlet air is warmed by the heater control mode of the refrigerant cycle.)

A/C UNIT CASE PROTECTION CONTROL

• The A/C auto amp. performs protection control for preventing the A/C unit case from being damaged by the

high temperature of the A/C unit case, due to PTC heater operation.

• A/C auto amp. detects the A/C unit case temperature around the PTC heater core with the A/C unit case

temperature sensor.

• When the temperature measured by the A/C unit case temperature sensor becomes 108

°C or more during

PTC heater operation, the A/C auto amplifier stops PTC heater operation.

• When the temperature measured by the A/C unit case temperature sensor becomes 105

°C or less, the A/C

auto amp. resumes PTC heater operation stopped by protection control.

AUTOMATIC AIR CONDITIONING SYSTEM : ECO Mode Control

INFOID:0000000010121950

DESCRIPTION

• When ECO mode is selected with the electric shift selector, VCM transmits the ECO mode request signal to

the A/C auto amp.

• When the A/C auto amp. receives the ECO mode request signal, it performs control that reduces the power

consumption of the A/C system.

ECO MODE CONTROL

• When ECO mode is selected, warm-up/cool-down control (refer to

HAC-232, "AUTOMATIC AIR CONDI-

TIONING SYSTEM : Electric Power Distribution Control"

) is cancelled and the special ECO mode power dis-

tribution control is performed.

• The A/C auto amp. determines the A/C system power consumption based on the ambient temperature and

set temperature.

NOTE:

When ECO mode control is activated, there is a noticeable decrease in A/C capacity when temperatures are

hot or cold.

AUTOMATIC AIR CONDITIONING SYSTEM : A/C-Heater Timer (Climate Ctrl. Timer)

INFOID:0000000010121951

DESCRIPTION

• When A/C-Heater Timer (Climate Ctrl. Timer) is set on the combination meter, the combination meter trans-

mits the A/C-Heater Timer (Climate Ctrl. Timer) request signal and A/C-Heater Timer (Climate Ctrl. Timer)

time setting (set vehicle occupancy time) to VCM.

ALIIA0792GB

SYSTEM

HAC-237

< SYSTEM DESCRIPTION >

[AUTO A/C (WITHOUT HEAT PUMP)]

HAC

• VCM starts two hours before the set A/C-Heater Timer (Climate Ctrl. Timer) time, and sends a request to the

A/C auto amp. for calculation of the A/C operation time required to achieve the target temperature, and

receives the results.

• When the operation time calculated by the A/C auto amp. has been reached, VCM starts the A/C auto amp.

and starts A/C-Heater Timer (Climate Ctrl. Timer).

A/C OPERATION DURING A/C-HEATER TIMER (CLIMATE CTRL. TIMER)

• During A/C-Heater Timer (Climate Ctrl. Timer), the A/C auto amp. operates the A/C under the following con-

ditions.

• If the charging plug is not inserted into the charging port at the time of A/C-Heater Timer (Climate Ctrl. Timer)

start, A/C-Heater Timer (Climate Ctrl. Timer) operation does not start. If the charging plug is disconnected

during A/C-Heater Timer (Climate Ctrl. Timer) operation, A/C-Heater Timer (Climate Ctrl. Timer) operation is

stopped.

AUTOMATIC AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset

INFOID:0000000010121952

A step motor is used for the mode door motor and air mix door motor.

Because the step motors do not have position detection mechanisms, there may be a deviation between the

door position recognized by the A/C auto amp. and the actual door position. Therefore, the A/C auto amp. per-

forms motor zero position reset in order to align its recognized door position with the actual door position.

When either of the conditions below is satisfied, the A/C auto amp. performs motor zero position reset when

the power switch next turns ON or when A/C-Heater Timer (Climate Ctrl. Timer) turns ON.

• The 12V battery terminal is disconnected and then is reconnected.

• The power switch is turned OFF during operation of the mode door motor or air mix door motor a total of 60

times.

During zero position reset operation, the DEF switch indicator flashes for several seconds. No switch opera-

tions are accepted during this time.

AUTOMATIC AIR CONDITIONING SYSTEM : Fail-safe

INFOID:0000000010121954

• When the A/C auto amp. detects the conditions shown below, it stops operation of the electric compressor.

JSIIA1782GB

Temperature control switch

Intake switch

Mode switch

Electric compressor

°C

Recirculation

D/F (during heating)

Max. 3500 rpm

Auto (during cooling)

Malfunction judgment item

Description

Recovery condition

UART communication malfunction
(Electric compressor

→ A/C auto amp.)

A/C auto amp. judges that there is a UART com-
munications malfunction.

UART communications occur normally
for two seconds or more.

HAC-238

< SYSTEM DESCRIPTION >

[AUTO A/C (WITHOUT HEAT PUMP)]

SYSTEM

• When the electric compressor detects the following conditions, compressor operation is restricted.

Intake sensor malfunction

Open circuit or short circuit is detected in the in-
take sensor circuit.

Voltage value of intake sensor circuit re-
turns to normal.

Ambient sensor malfunction

Open circuit or short circuit is detected in the am-
bient sensor circuit.

Voltage value of ambient sensor circuit
returns to normal.

Malfunction judgment item

Description

Recovery condition

Malfunction judgment

item

Description

Compressor op-

eration

Recovery condition

Compressor discharge
temperature overheat

Compressor discharge refrigerant temperature (estimated
value) is more than 130

°C.

Stopped

Compressor stops for five
minutes then restarts.

Compressor IPM over-
heat

IPM temperature is more than 125

°C within one minute af-

ter start.

Stopped

IPM temperature drops to
123

°C or less.

IPM temperature is more than 88

°C at least one minute af-

ter start.

IPM temperature drops to
86

°C or less.

Compressor voltage
saturation

Inverter output voltage is 140% or more.

Compressor
speed is limited.

Inverter output voltage drops
to under 140%.

Compressor overcur-
rent

Start failed three times because current of 35.1 A or more
flowed within 90 seconds after start.

Stopped

IGN_OFF

Current of 35.1 A or more flows when compressor is
stopped.

Compressor overload

DC input is more than 13.5 A.

Compressor
speed is limited.

DC input drops to 13.5 A or
less for 15 seconds.

Compressor low-voltage
malfunction

High voltage is below 230 V.

Stopped

High voltage rises to 235 V
or more.

Compressor high-volt-
age malfunction

High voltage is more than 420 V.

Stopped

High voltage drops to 415 V
or less.

Compressor IPM tem-
perature sensor mal-
function

It is judged that an IPM temperature sensor open circuit or
short circuit is occurred.

Stopped

The IPM temperature sensor
open circuit or short circuit
judgment is cancelled.

Compressor shunt sig-
nal offset malfunction

It is judged that an unexpected shunt signal value is oc-
curred.

Stopped

IGN_OFF

Compressor ROM,
RAM, AD malfunction

A data malfunction is detected in the ROM area or RAM
area.
It is judged that an unexpected AD value is occurred.

Stopped

IGN_OFF

Compressor discharge
temperature restriction

Estimated discharge temperature exceeded 110

°C.

Compressor
speed is limited.

IPM temperature drops to
108

°C or less.

Compressor IPM tem-
perature restriction

IPM temperature exceeded 83

°C.

Compressor
speed is limited.

IPM temperature drops to
81

°C or less.

Compressor low-speed
overload

Compressor is not operating at command speed.

Compressor
speed increase

Current is decreased and
compressor became able to
operate at command speed.

UART communication
malfunction (Electric
compressor

→ A/C auto

amp.)

Electric compressor judges that a UART communication
malfunction is occurred.

Stopped

UART communications oc-
cur normally for two seconds
or more.

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