Nissan Primera P11. Instruction — part 485
●
Example
p
2
When the temperature in the vehicle is higher than the set
temperature.
When the temperature in the vehicle is high, in-vehicle sen-
sor resistance is small and the input voltage to the auto
amplifier becomes small. As a result, the voltage from the air
mix door position arithmetic circuit also becomes small.
When this voltage is smaller than the voltage from the PBR,
comparator (2), Tr
p
2
and Tr
p
3
turn ON.
Accordingly terminal No.
p
13
becomes
!
and terminal No.
p
12
becomes
@
. The air mix door motor rotates counterclock-
wise and the air mix door moves toward the “COLD” side.
As the air mix door moves toward the “COLD” side, the volt-
age from the PBR becomes smaller and consequently
becomes equal to that from the air mix door position arith-
metic circuit. As a result, comparator (2) turns OFF and the
air mix door motor stops.
AIR MIX DOOR MOTOR
The air mix door motor is attached to the heater unit. It rotates
so that the air mix door is opened to a position set by the auto
amplifier. Motor rotation is conveyed through a shaft. The air mix
door position is then fed back to the auto amplifier by the PBR
built into the air mix door motor.
SHA569CB
Auto amp.
Comparator
(1)
Air mix door
position
arithmetic
circuit
PBR
Comparator
(2)
Air mix
door
motor
SHA570CB
Auto amp.
Comparator
(1)
Air mix door
position
arithmetic
circuit
PBR
Comparator
(2)
Air mix
door
motor
KHA127
Air mix door link
Air mix door lever
Air mix door motor
Heater unit
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-93
2
1
Air mix door
operation
Direction of lever movement
!
@
COLD
,
HOT
Clockwise
(Toward passenger compartment)
—
—
STOP
STOP
@
!
HOT
,
COLD
Counterclockwise
(Toward engine compartment)
PBR
Measure voltage between terminals
p
3
and
p
4
at vehicle har-
ness side.
Ignition switch: ON
●
Ensure tester pointer deflects smoothly when PTC is moved
from 18°C (64°F) to 32°C (90°F) and vice versa.
RHA026H
Air mix door motor
connector M413
(HOT
side)
(Cold
side)
PBR
KHA129
Characteristic PBR
Resistance
of
PBR
(
Ω
)
(resistance
between
terminal
p
4
and
p
3
)
.
3.0
2.5
2.0
1.5
1.0
0.5
COLD
Air mix door opening angle
HOT
60°
NHA311
Air mix door motor
RHA607AA
V
oltage
(V)
Full cold
Full hot
Air mix door opening angle PBR
specification
5.0
4.0
3.0
2.0
1.0
0
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-94
FAN SPEED CONTROL
Component parts
Fan speed control system components are:
1) Auto amplifier
2) In-vehicle sensor
3) Ambient sensor
4) Sunload sensor
5) A/C switch relay
6) A/C switch
7) Fan switch
8) Blower motor
9) Resistance
10) HI, MH, ML and LO relays
System operation
Blower fan speed is automatically controlled so that the in-vehicle temperature is maintained to the set tem-
perature.
The temperature set by the PTC (Potentio Temperature Control) and the temperature detected by the in-
vehicle sensor and ambient sensor are compensated by the sunload sensor signal. The auto amplifier then
determines fan speed from the ON-OFF operation of the A/C switch. The fan speed decision by the auto
amplifier activates the fan relay and the blower fan motor rotates. When the A/C switch is ON, fan speed is
activated in 4 steps, HI, MH, ML, and LO. When the A/C switch is OFF, fan speed is activated in 3 steps,
MH, ML, and LO.
KHA130
Auto amplifier
In-vehicle
sensor
Ambient
sensor
Sunload
sensor
A/C switch
Constant voltage
transformation
Air mix door posi-
tion arithmetic cir-
cuit
Sunload compen-
sation
A/C operation
signal detection
Air flow volume
arithmetic circuit
HI relay
MH
relay
ML
relay
Blower
motor
Resistor
LO relay
Fan switch
(AUTO)
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-95
Signals from each sensor, PTC, A/C switch etc. are sent to the
air flow volume arithmetic circuit in the auto amplifier. Air flow
volume is determined by this circuit.
(1) When the air flow volume is set to ML
The air flow volume arithmetic circuit gives current to Tr
p
3
,
which turns the ML relay on. Thus, the blower motor rotates
in the ML condition.
SHA573CC
SHA574CA
Air flows
volume
arithmetic
circuit
HI
relay
MH relay
ML relay
Blower
motor
Resistor
Fan switch
(AUTO)
A/C (LO) relay
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-96
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст