CONTROL SYSTEM
01–40–50
•
Built into the intake air temperature IAT sensor.
•
Converts the mass intake airflow amount into a
voltage.
•
When the heating element is placed in the air, the
heat is dissipated by the air cooling the heating
element. If there is a large volume of air
circulating around the heating element, the
amount of heat that is dissipated increases. This
heat transfer utilizes the voltage which is changed
by the heat transfer phenomenon.
End Of Sie
FRONT HEATED OXYGEN SENSOR (HO2S) FUNCTION
CHU014018860S01
•
The wide-range air/fuel ratio sensor, which can linearly detect the oxygen concentration (air/fuel ratio of the air-
fuel mixture) in the exhaust gas in all ranges, from lean to rich, is used on the front HO2S.
•
A heater has been adopted on the front HO2S, allowing stable detection of the oxygen concentration even
when the exhaust gas temperature is low.
End Of Sie
FRONT HEATED OXYGEN SENSOR (HO2S) CONSTRUCTION/OPERATION
CHU014018860S02
•
Installed on the exhaust manifold.
•
The wide-range air/fuel ratio sensor is a pump cell
type sensor, using both the oxygen concentration
cell action and oxygen pump cell action, and can
detect the oxygen concentration (air/fuel ratio of
the air-fuel mixture) in the exhaust gas in all
ranges, from lean to rich.
•
A heater is built into the sensor to facilitate the
activation of the HO2S at engine startup (when
the exhaust gas temperature is low).
Operation
•
The wide-range air/fuel ratio sensor converts the
oxygen concentration in the exhaust gas into a
current value, and sends the value to the PCM.
•
The PCM calculates the
λ
(lambda) value of the
air-fuel mixture based on the received current
value.
•
(
λ
(lambda)) = (actual air/fuel ratio)/
(stoichiometric air/fuel ratio)
End Of Sie
AIR THERMOMETER
HOT WIRE
INTAKE AIR
CHU0140S080
HIGH
LOW
VOLTAGE
LOW
HIGH
INTAKE AIR AMOUNT
B+
MAF SENSOR
MAF SENSOR
OUTPUT VOLTAGE CHARACTERISTIC
PCM
CPU
CONTROL CIRCUIT
AIR THERMOMETER
HOT WIRE
VOLTAGE
CURRENT
CHU0140S081
FRONT HO2S
CHU0140S061
0.7
0.9
0.8
1
1.1
1.2
1.3
1.4
-1.5
-1
-0.5
0
0.5
1
10.29
13.23
11.76
14.7 16.17 17.64 19.11 20.58
(
λ
)
(A/F)
CURRENT(mA)
CHU0140S074
Содержание 2004 RX-8
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