CLK 55 AMG Cabriolet (208.474) V8-5.5L (113.984) (2002)
Oil sensor, purpose
Detecting oil level, oil temperature, oil quality
Oil sensor, design
The oil sensor consists of:
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electronics with 3-pin connector
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capacitive measuring element (capacitor) with integrated temperature sensor
Oil sensor, function
Oil level and oil quality are detected by the capacity of the engine oil (dielectric). The oil temperature is detected by the temperature sensor. All
signals are processed in the electronics to form a PWM signal.
Oil sensor
The oil sensor (level, temperature, quality, B40) is used for obtaining the oil data.
In principle it consists of 2 capacitor systems which use the engine oil as a dielectric. When the condition of the oil changes (e.g. due to absorption of
water) and/or the oil level changes, the capacity of the "capacitor" changes.
If measurement is accomplished with only one capacitor system, it is not possible to differentiate between a change in the oil level and the oil condition
when the capacity changes. For this reason the sensor has a second capacitor system, which is always located in the oil and therefore provides a
comparative value (correction factor).
The oil level can be determined reliably only using the readings from both capacitor systems.
The oil sensor (level, temperature, quality, B40) also has a temperature sensor. It is used to measure the temperature of the engine oil
All signals are processed in the electronic circuitry integrated into the sensor to form a PWM (Pulse Width Modulation) signal and read in by the
continuous fuel injection control module (N3).