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Nissan Juke F15. Manual - part 844

COMPONENT PARTS

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection ares and a

signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance

according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static

capacitance into a voltage value, and transmits the voltage value to ECM.

Magnet Clutch

INFOID:0000000012200007

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

SYSTEM

System Diagram

INFOID:0000000012200008

System Description

INFOID:0000000012200009

DESCRIPTION

• Automatic air conditioning system is controlled by each function of A/C auto amp., BCM, ECM and IPDM E/

• Each operation of air conditioning system is transmitted from multi display unit via CAN communication. A/C

auto amp. transmits each type of indication information to multi display unit via CAN communication. Multi

display unit displays each type of indication information that is received.

CONTROL BY A/C AUTO AMP.

•

HAC-13, "Temperature Control"

•

HAC-14, "Air Outlet Control"

•

HAC-14, "Air Flow Control"

•

HAC-15, "Air Inlet Control"

•

HAC-15, "Compressor Control"

•

HAC-16, "Door Control"

•

HAC-19, "ECO Mode Control"

• Correction for input value

Ambient temperature correction

- The A/C auto amp. inputs the temperature detected with the ambient sensor as the ambient temperature.

JMIIA1049GB

SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

- Perform the correction of the temperature detected with the ambient sensor for air conditioning control.

- Select and use the initial value of ambient temperature data depending on the engine coolant temperature

when turning the ignition switch from OFF to ON. Use the detection temperature of the ambient sensor at

low coolant temperature [less than approximately 56

°C (133°F)]. Use the memory data (before the ignition

switch is OFF) when the engine is warming up [approximately 56

°C (133°F) or more].

- Do not perform the correction of the ambient temperature when the detection temperature of the ambient

temperature is less than approximately

−20°C (–4°F).

Passenger room temperature correction

- The A/C auto amp. inputs the temperature detected with the in-vehicle sensor as the passenger room tem-

perature.

- Perform the correction of the temperature detected with the in-vehicle sensor for air conditioning control.

- The A/C auto amp. performs the correction so that the recognition passenger room temperature changes

depending on the difference between the detected passenger room temperature and the recognition pas-

senger room temperature. If the difference is large, the changing is early. The changing becomes slow as

the difference becomes small.

Intake temperature correction

- The A/C auto amp. inputs the temperature detected with the intake sensor as the intake temperature.

- Perform the correction of the temperature detected with the intake sensor for air conditioning control.

- The A/C auto amp. performs the correction so that the recognition intake temperature changes depending

on the difference between the detected intake temperature and the recognition intake temperature. If the dif-

ference is large, the changing is early. The changing becomes slow as the difference becomes small.

Sunload amount correction

- The A/C auto amp. inputs the sunload amount detected with the sunload sensor.

- Perform the correction of the sunload amount detected with the sunload sensor for air conditioning control.

- When the sunload amount suddenly changes, for example when entering a tunnel, perform the correction so

that the recognition sunload amount of the A/C auto amp. changes slowly.

Set temperature correction

- A/C auto amp. controls The A/C auto amp. performs the correction to the target temperature set by the tem-

perature control switch so as to match the temperature felt by the passengers depending on the ambient

temperature detected with the ambient sensor and controls it so that the interior air temperature is always

the most suitable.

CONTROL BY BCM

•

HAC-15, "Compressor Control"

CONTROL BY ECM

•

HAC-15, "Compressor Control"

• Cooling fan control. Refer to

EC-65, "COOLING FAN CONTROL : System Description"

CONTROL BY IPDM E/R

•

HAC-15, "Compressor Control"

• Cooling fan control. Refer to

PCS-10, "POWER CONTROL SYSTEM : System Description"

Temperature Control

INFOID:0000000012200010

• When ignition switch is in the ON position, A/C auto amp. always

automatically controls temperature regardless of air conditioner

operational state.

• A/C auto amp. calculates the target air mix door opening angle

depending on set temperature, in-vehicle temperature, ambient

temperature, and sunload.

• Air mix door is controlled depending on the comparison of current

air mix door opening angle and target air mix door opening angle.

• Regardless of in-vehicle temperature, ambient temperature, and

sunload, air mix door is fixed at the fully cold position when set

temperature is 18

°C (60°F), and at the fully hot position when set

temperature is 32

°C (90°F).

JPIIA0633GB

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

Air Outlet Control

INFOID:0000000012200011

• While air outlet is in automatic control, A/C auto amp. selects the

mode door position depending on a target air mix door angle and

outlet air temperature calculated from sunload.

• If ambient temperature is excessively low, D/F is selected to pre-

vent windshield fogging when air outlet is set to FOOT.

Air Flow Control

INFOID:0000000012200012

DESCRIPTION

• A/C auto amp. changes gate voltage of power transistor and controls air flow continuously. When air flow is

increased, voltage of blower motor gradually increases to prevent a sudden increase in air flow.

• In addition to manual control and automatic control, air flow control is compose of starting fan speed control,

low coolant temperature starting control, high in-vehicle temperature starting control, and blower speed con-

trol at door motor operation.

AUTOMATIC AIR FLOW CONTROL

• A/C auto amp. decides target air flow depending on target air mix door opening angle.

• A/C auto amp. changes voltage of blower motor and controls air flow continuously so that air flow matches to

target air flow.

• When air outlet is VENT or B/L, the minimum air flow is changed

depending on sunload.

STARTING FAN SPEED CONTROL

When blower motor is activated, A/C auto amp. gradually increases voltage of blower motor to prevent a sud-

den increase in discharge air flow. (T

1 –

= approximately 8 seconds)

NOTE:

Do not perform the starting air flow control when the discharge outlet

is set to DEF.

LOW COOLANT TEMPERATURE STARTING CONTROL

JMIIA0710GB

JMIIA1129GB

JMIIA1130GB

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