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10-10
4) System Operation
Glow plug is installed in the cylinder head. It enhances the cold starting performance and reduces
the exhaust gas during cold starting.
ECU receives the various signals such as engine rpm, coolant temperature and vehicle speed
through CAN communication lines. GCU controls the pre-heating, cranking and post-heating
operations and monitors the glow plug. If GCU detects a problem, it sends the result to ECU.
(1) Characteristics of temperature and current in AQGS
1.
AQGS unit increases the glow plug temperature very rapidly (1,000˚C in 2 seconds).
2.
FET (similar to transistor) for each cylinder in AQGS unit pre-heats the glow plug.
3.
If the glow plug temperature reaches to target temperature, the temperature is
controlled by duty ratio.
AQGS PWM Control
AQGS unit supplies the power to glow plug.
(2) Operation of AQGS
Frequency: 20~33Hz
PWM Control duty ratio
- 1st step: 100%
- 2nd step: 35%
- 3rd step: 23%
Actual voltage pattern
This shows the voltage and time
supplied by AQGS by steps. As
shown on the graph, the supplied
voltage is decreased as the steps are
continued. The 3rd step is to keep
the temperature, not to raise it.
1.
Duty control area:
Between 5 and 100%
2.
Frequency: 20 Hz
3.
Duty ratio = (RMS voltage)²
(Battery voltage)²
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