Ambient air temperature prediction

Details Ambient air temperature prediction Ambient air temperature prediction

2005-12-13

2005-12-13

Verbitsky, Gail (Department: 2859)

Thermal measuring and testing

Temperature measurement

Combined with diverse art device

C374S141000

Reexamination Certificate

active

06974251

ABSTRACT:
Methods and apparatus are provided for predicting ambient air temperature (PAT) around a vehicle (and partly controlling vehicle operation) based on Mass Air Flow (MAF), Vehicle Speed (VSS), Inlet Air Temperature (IAT), Engine Run Time (ERT) and the last PAT value (LPAT). If MAF,VSS are below thresholds C1,C2and ERT is below threshold C4,then PAT is set equal to the smaller of IAT or LPAT. If MAF,VSS,ERT exceed C1,C2,C4,as for example, in steady run operation, then after an interval PAT approaches IAT−C5+/−C6where C5and C6are stored parameters. An idle counter increments when MAF<C1,VSS<C2is TRUE and decrements by parameter C3when FALSE and must reach zero before the PAT steady run value is set. This improves prediction accuracy during transition from idle to steady state running. The PAT estimation process is repeated about every 10 seconds.

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