Operation Section
1
–
31
Duty Ratio Control
- The engine ECU outputs sawtooth wave signals with a constant frequency. The value of the current is the effective
(average) value of these signals. As the effective value increases, the valve opening decreases, and as the effec-
tive value decreases, the valve opening increases.
When the SCV Energized Duration (Duty ON Time) is Short
- When the SCV energization time is short, the average current flowing through the solenoid is small. As a result, the
needle valve is returned by spring force, creating a large valve opening. Subsequently, the fuel suction quantity
increases.
QD0710E
Average Current Difference
Actuating Voltage
ON
OFF
Current
Low Suction Quantity High Suction Quantity
Q002341E
Needle
Valve
Large Valve
Opening
SCV
Feed Pump
Conventional SCV
To Next Page
Loading...
