Joyner JNSZ1600QL, Owner'S Manual

Page: 123 / 215

122
R1=0.55
Ω
+/-10% (20
℃
) R2=7400
Ω
+/-10% (20
℃
)
The base ignition advance value in the chart is determined after several adjustments according to the
coolant temperature and air temperature. One filter restricts the change of two continuous TDCs, Under a
specified condition, ignition advance will be compensated dynamically.
Base ignition advance value, as a function of manifold absolute pressure and engine speed, is inserted
into two-dimension diagram.
At a rather low speed, ignition advance remains fixed. The positive and negative change of ignition
advance between two continuous TDCs is limited by two calibration values.
The dynamic compensating of ignition advance occurs under the following conditions:
—— During idling or running without rpm fluctuations
—— During acceleration and deceleration shut
—— When shutten off
—— During over speeding
during idling, the engine rpm is 900
±
50r/min
，
and ignition advance is 10
°±
1
°
(Engine is already
warmed and with no electrical load).
6 . Zirconium
λλλλ
sensor is designed to detect the oxygen in exhaust emission
In endothermal engine, the combustion is produced by the reaction of hydrogen and oxygen and then
emits heat. Fuel is composed of hydrocarbons. It includes carbon atom and hydrogen atom which are
combined together by different modes (paraffin, olefine, aromatics).
The main products of the air and fuel combusting are carbon dioxide (CO2), vapor (H2O), carbon
monoxide (CO) and a small percent of unburned hydrocarbon (HC) and nitrogen oxide (NOX). The last
two are measured by ppm.
For the pollution problem, only carbon monoxide exists largely in the form of bulk.
Nitrogen oxides is composed of the oxidized mixture. The main ingredients are as following:
Dinitrogen oxide, nitrogen monoside (NO), nitrogen dioxide
NOX is the traditional symbol for these oxide. NO covers over 95% of them.
In order to minimize pollution (CO,HC and NOX)
，
“
λ
sensor”is installed into the system to detect the
oxygen content in exhaust emission.
The signal coming from the sensor is sent to ECU for adjusting the mixing ratio of air and fuel,
ensuring the catalytic converter work under the optimal condition.
The sensor is located in the first section of exhaust pipe, in front of the catalytic converter.
It is enclosed by ceramic zirconia body (1) with thin platinum plate at one end. The latter one is