Originally Posted by Uit SSP 441, pagina 37

Calculating the oil level The oil level is calculated by two measurement methods, namely dynamic and static measurement.The dynamic measurement is performed while the vehicle is in operation.

Important measurement factors are:
– engine speed,
– longitudinal and transverse acceleration, from ESP control unit,
– bonnet contact (bonnet must be closed),
– engine temperature (engine should be at operating temperature),
– driving cycle after last bonnet contact > 50 km and
– a certain number of measured values must be generated within the driving cycle.

The dynamic measurement provides more accurate results, and therefore is mainly used. However, it cannot be used at all times.

The measurement process is interrupted at:
– rates of acceleration of over 3 m/s2,
– oil temperature > 140 °C and
– bonnet contact switch F266 was actuated.

To obtain data in these situations, the static meas-urement method is applied. The static measurement is performed at:
– ignition "on" (to obtain a measurement result as quickly as possible, the measuring process is started when the driver's door is opened),
– engine oil temperature > 40 °C,
– engine speed < 100 rpm and
– engine at standstill > 60 sec.

Again, the acceleration data from the ESP is taken into account in order to allow for inclination of the vehicle. The signal from the parking brake is also utilised. In the case of fluid levels that can lead to engine damage (measured value below min.), an underfill warning is issued. In the case of fluid levels which can led to engine damage (measured value above max.), an overfill warning is issued