Nissan Altima HL32 Hybrid. Manual - part 498

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-13

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[AUTOMATIC AIR CONDITIONER]

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START:

• Initial compulsory signal is sent to each of the door motors.

ADDRESS:

• Data sent from the auto amp. are selected according to data-based decisions made by the mode door motor,

air mix door motors and intake door motor.

• If the addresses are identical, the opening angle data and error check signals are received by the door motor

LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door

control begins.

• If an error exists, the received data are rejected and corrected data received. Finally, door control is based

upon the corrected opening angle data.

OPENING ANGLE:

• Data that shows the indicated door opening angle of each door motor.

ERROR CHECK:

• In this procedure, transmitted and received data is checked for errors. Error data are then compiled. The

error check prevents corrupted data from being used by the mode door motor, the air mix door motors and

the intake door motor. Error data can be related to the following symptoms.

- Malfunction of electrical frequency

- Poor electrical connections

- Signal leakage from transmission lines

- Signal level fluctuation

STOP SIGNAL:

• At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered

to the auto amp. This completes one data transmission and control cycle.

AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)

The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined

value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.

FAN SPEED CONTROL

Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-

ture, intake temperature, amount of sunload and air mix door position.

With pressing AUTO switch, the blower motor starts to gradually increase air flow volume.

When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-

ing.

INTAKE DOOR CONTROL

The intake door is automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-

perature, intake temperature, amount of sunload, temperature of high voltage battery and ON/OFF operation

of the compressor.

MODE DOOR CONTROL

JSIIA0249GB

HAC-14

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-

ature, intake temperature and amount of sunload.

ELECTRIC COMPRESSOR CONTROL

When A/C switch, AUTO switch, DEF switch is pressed or when shifting mode position D/F, auto amp. trans-

mits compressor control signal to HV ECU.

HV ECU turns ON to the electric compressor.

HV ECU sends compressor feedback signal to auto amp., then, uses input compressor feedback signal to

control air inlet.

COMPRESSOR SPEED CONTROL

• The auto amp. calculates the target compressor speed based on the target evaporator temperature (calcu-

lated from the intake sensor, ambient sensor, and sunload sensor) and the actual evaporator temperature

detected by the intake sensor. Then, the auto amp. transmits the target speed to the HV ECU. The HV ECU

controls the electric compressor (inverter) based on the target speed data in order to control the compressor

to a speed that suits the operating condition of the air conditioning system.

• The auto amp. calculates the target evaporator temperature, which includes corrections based on the in-

vehicle sensor, ambient sensor, sunload sensor, and intake sensor. Accordingly, the auto amp. controls the

compressor speed to an extent that does not inhibit the proper cooling performance or defogging perfor-

mance. As a result, comfort and low fuel consumption can be realized.

Component Part Location

INFOID:0000000004215298

ENGINE COMPARTMENT

JSIIA0308GB

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-15

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PASSENGER COMPARTMENT

1.

Refrigerant pressure sensor

2.

Heater pump

3.

Electric compressor

4.

Ambient sensor

JPIIA0010ZZ

HAC-16

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

Component Description

INFOID:0000000004215299

1.

Controller (auto amp.)

2.

Mode door motor

3.

Air mix door motor (driver side)

4.

Sunload sensor

5.

In-vehicle sensor

6.

Intake sensor

7.

Air mix door motor (passenger side) 8.

Blower motor

9.

Intake door motor

JPIIA0011ZZ