Jinhan ADO102 Manual page 18

⑥waveform can be self-fulfilling their needs by adjusting the time base, vertical volts /
division and trigger mode (time base, vertical volts / division and other specific operations,
please refer to the Universal oscilloscope operation)
Note:
The oxygen sensor, also known as the exhaust gas sensor, is a very important role in the
exhaust emission control of a vehicle equipped with a catalytic converter.
The oxygen sensor is arranged on the exhaust pipe and in front of catalytic converter. The
variation range of the voltage of the zirconium oxygen is 0-1V, and the voltage variation
range of titanium oxide is 0-5V, because the titanium oxygen sensor needs the power
supply voltage. A vehicle equipped with an oxygen sensor is referred to as a "closed loop",
meaning that the sensor will analyze the exhaust gas and re adjust the engine oil supply
according to the results after the fuel is burned.
No matter how many connection lines between the oxygen sensor and the engine control
module, the sensor output is always a black line.
Single Line: This line is used to produce the output voltage of the sensor itself, usually
black.
Two lines: one output line output and a ground line.
Three lines: one output line and two-line heating device (power line and ground line).
Interior heating means to raise the temperature at cold start to make the cars quickly
brought under control.
Four-wire: a signal line and a signal ground. Two other heating device lines.
Zirconium oxygen sensor needs to reach more than 300 degrees Celsius temperature in
order to work properly, this kind of oxygen sensor normal output feedback voltage change
between 0 ~ 1V. 0.5V above the output indicates that the mixture is too thick; 0.5V output
indicates that the appropriate balance between lean and too thick; 0.5V the following
output indicates that the mixed gas is too thin. The output voltage variation indicates that
the engine control module changes the air fuel ratio
(the ratio of air to fuel, the concentration of the mixture).
zirconia's oxygen sensor output voltage
Normal
waveform should meet the 3 elements: the maximum
voltage, the minimum voltage, response time (voltage
from high to low change of time). In general, the
allowable range is the maximum voltage value > 850mV,
the minimum voltage is 75 ~ 175mV, and the response
time is less than 100ms. For the change of the amplitude
of the waveform is in the idle state of the 10s amplitude
of the waveform is not less than 8 times as shown in
figure 7.
Start the engine and keep
1500-2000rpm, after 3 minutes, until the engine reaches
normal working temperature, because the engine must
reach normal working temperature and into the closed
loop, oxygen sensor signal readout instrument is
correct.
Note: 1、The axis is a peak-to-amplitude
2、 Peak to trough for the two amplitudes， not one
the engine speed
Wavelength
Pic-7 Zirconia oxygen sensor
Amplitude
Amplitude
One amplitude
15