PRE-RELEASE
Glow duration control
| Glow duration control |
Glow duration control comprises four different sub-functions:
| - |
Preheating
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| - |
Starting preparation heating
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| - |
Starting glow
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| - |
Afterglow
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| Preheating |
Depending on the temperature of the engine coolant, preheating starts when the ignition is turned to ON. At the same time, information that preheating is active is sent on the P-bus and read by the main instrument unit. This turns on the preheating indicator lamp. Preheating depends on the temperature of the engine coolant, see table.
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Temperature °C (°F)
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Duration
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+5 (+41.0)
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inactive
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-10 (+14.0)
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5 seconds
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-20 (-4.0)
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10 seconds
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If the engine speed exceeds 42 rpm before the time expires, preheating will be deactivated.
| Starting preparation heating |
Starting preparation heating starts after preheating if the following conditions are met:
| - |
Preheating duration longer than 0 seconds
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| - |
Preheating time has expired
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Starting preparation heating is shut off when the engine speed exceeds 42 rpm or after 30 seconds.
| Starting glow |
Starting glow takes place each time the engine is started (over 42 rpm) if the engine coolant temperature is lower than 25°C (77°F). The function is deactivated if any of the following parameters are fulfilled:
| - |
Starting glow duration of 2 minutes has expired
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| - |
Engine coolant temperature rises above 25°C (77°F)
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| - |
Engine speed exceeds 750 rpm (engine running)
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| Afterglow |
Once the engine has started, the control module supplies alternate pairs of glow plugs (1-3/2-4) with power.
Afterglow starts when the engine speed exceeds 750 rpm and is active as follows:
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Coolant temperature °C (°F)
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Duration
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17 (62.6)
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3 minutes
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20 (68.0)
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40 seconds
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40 (104.0)
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40 seconds
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41 (105.8)
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inactive
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Afterglow is temporarily shut off if the engine speed exceeds 2500 rpm or if the injected fuel quantity corresponds to the value in the table.
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Coolant temperature °C (°F)
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Fuel quantity
(mg/combustion) |
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40 (104.0)
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37
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30 (86.0)
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40
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10 (50.0)
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45
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-10 (14.0)
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55
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-20 (-4.0)
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65
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-30 (-22.0)
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70
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The period of afterglow continues even if it is interrupted by one of the above conditions.
