Outside temperature value suppression
The computation model in the auxiliary instrument compensates for the effect that the residual heat from the engine compartment has on the ambient temperature signal. The increase in temperature is delayed. The input variables for the calculation model are:
- Driving speed
- Coolant temperature
- Status engine on/off
- Ambient temperature
A drop in the ambient temperature is adopted and not damped. The engine and the body cannot be colder than the ambient temperature.
NOTE:
Under certain circumstances, an incorrect display of the ambient temperature is physically unavoidable
Under certain driving conditions, the display deviates from the real value due to damping action. In the event of a customer complaint, this behavior must be explained as the state of the art.
Example for ambient temperature compensation:
Highway driving followed by urban traffic, then stationary traffic
| Item | Explanation |
|---|---|
| 1 | Highway driving, 20 minutes, driving speed greater than 80 km/h |
| 2 | Urban traffic, 20 minutes, driving speed greater than 40 km/h |
| 3 | Traffic jam, 20 minutes, driving speed 0 km/h |
| 4 | Measured value of the outside temperature sensor |
| 5 | Outside temperature display in the instrument panel |
| 6 | Real ambient temperature |