106
Fig.164
When fuel injector is not operating, it is sealed and doesn’t allow fuel drain. Fuel needed by engine, is
controlled by ECU (supplied electricity by relay (87)) directly. And ECU decides the open time of each
intake order and fuel injection duration.
Fuel injection time is controlled by the following measures:
-Synchronous (for normal operation). Injector opening corresponds with every TDC.
-Not synchronous (for idling, cut-off, low speed, start operation). Injector opening is completely
controlled by time and not related to TDC signal.
ECU has a basic current control circuit to control fuel injector. The circuit produces the maximal
current (signal) at the first control order speed up the opening of injector. Once maximum current is
attained , the circuit will automatically change to and keep the current I=1A
±
0.3 A(Mean).
Injection duration is showed on the 2-dimension figure as a function of engine speed and intake
manifold absolute pressure. After engine warming up or speed turns to be stable, injection duration is 1
～
4mS.
Injection duration is increasing basically under special operation condition, such as accelerating, cold
starting, engine warming up. As accelerator pedal is released, fuel will be cut off. (ti=0mS). Running
condition and readjusting condition may be changed according to water/ intake air temperature or A/C
condition.
——intake air temperature sensor “ATS05”
It is consisted of N.T.C.(Negative Temperature Coefficient) thermo resistance and 2-way junction box
that are installed in the plastic setting molding case. Sensor resistance will changed with intake air
temperature.
Содержание JNSZ1600DL
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