GF07.61-P-4027AM Overheating/Pinging Protection, Function

GF07.61-P-4027AM Overheating/Pinging Protection, Function
ENGINE 113.990 in MODEL 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230 up to Model Year 2008
ENGINE 113.993 in MODEL 463 up to 31.5.12
ENGINE 113.995 in MODEL 230 up to Model Year 2008





B6/1 Camshaft Hall sensor
B11/4 Coolant temperature sensor
B17/8 Charge air temperature sensor
B28 Pressure sensor (charge air)
L5 Crankshaft position sensor
M16/6 Throttle valve actuator
N3/10 ME control unit
R4 Spark plugs
T1/1-
T1/8 Cylinder 1 to 8 ignition coils

The task of the overheating/pinging protection is to protect against engine damage as a result of excessive thermal overload and overheating damage of the catalytic converters.

If the coolant temperature/charge air temperature is too high, the ignition timing point is retarded in line with engine speed and load. The correction by retarding the ignition timing is map-controlled by the ME control unit.

The retardation of the ignition timing point commences at a coolant temperature of approx. 90°C and a charge air temperature of approx. 20°C.

The ignition timing is retarded e.g.:

-at 100°C coolant, 20°C charge air and full load 2° crank angle
-at 100°C coolant, 60°C charge air and full load 8° crank angle
-at 125°C coolant, 60°C charge air and full load 11° crank angle

The following information is processed in the ME-SFI control unit:

^ Boost air temperature
^ Charge air pressure
^ Coolant temperature
^ Engine speed
^ Camshaft and crankshaft position (ignition circuit detection)
^ Throttle valve position

The ignition angle corrections of the overheating/pinging protection and anti-knock control are added based on the performance map.