Overheating/pinging protection, function - GF07.61-P-4027AM

ENGINE 113.990 in MODELS 211, 219 

ENGINE 113.991 in MODELS 215, 220 

ENGINE 113.992 in MODEL 230 

ENGINE 113.993 in MODEL 463 

ENGINE 113.995 in MODEL 230 

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.

	Crankshaft position sensor, location/task/design/function		GF07.04-P-4116AM
	Camshaft Hall sensor, location/task/design/function		GF07.04-P-4117HA
	Pressure sensor, location/task/design/function		GF07.04-P-5014AM
	Coolant temperature sensor, location/task/design/function		GF07.04-P-5026AM
	Charge air temperature sensor, location/task/design/function		GF07.04-P-5039AM
	ME-SFI control unit, location/task/design/function		GF07.61-P-5000AM
	Spark plugs, location/task/design/function		GF15.10-P-3101AM
	Ignition coils, location/task/design/function		GF15.10-P-3102AM
	Throttle valve actuator, location/task/design/function		GF30.22-P-4101AM