SSANGYONG Rodius 2012.07 Manual page 290

4) 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 data (engine rpm, coolant temperature, vehicle speed) through CAN lines.
Based on the data, GCU controls the pre-glow, cranking and post-glow. It also checks the glow
plugs, and sends the result to ECU.
(1) Temperature/Current Properties of GCU
Step 1: GCU increases the temperature of glow plug very rapidly (approx. 2 seconds up to
1000°C)
Step 2 & 3: FETs (similar to transistor) for each cylinder are integrated in GCU. During the pre-
glow period, battery voltage is supplied to the glow plugs directly to heat them rapidly.
After getting the desired temperature by pre-glowing, the temperature is controlled by
Step 4: duty ratio.
Step 1: I1
Step 2: I2
Step 3: I3
Step 4: I4
- This shows the supplying voltage and time by GCU in each step. The step 4 is the period to
keep the temperature.
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