External temperature display control algorithm

Details External temperature display control algorithm External temperature display control algorithm

2007-02-07

2010-02-23

Dunn, Drew A (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Temperature measuring system

C374S133000, C374S137000, C340S449000, C340S588000

Reexamination Certificate

active

07668686

ABSTRACT:
A method of controlling an initial external temperature display in a vehicle may include comparing an ignition-off time with a first threshold and displaying a current reading from an outside ambient temperature sensor when the ignition-off time equals or exceeds the first threshold. The method further includes comparing at least one secondary condition with at least one secondary parameter when the ignition-off time falls below the first threshold and selecting and displaying a reading based on the comparison of the at least one secondary condition with the at least one secondary parameter. This comparison can include comparing a previous ignition-on time with a second threshold and comparing a sum of the ignition-off time and a stored amount with a third threshold when the previous ignition-on time equals or falls below the second threshold. Alternatively, this comparison can include comparing an engine water temperature with a temperature threshold.

REFERENCES:
patent: 5416728 (1995-05-01), Rudzewicz et al.
patent: 6665629 (2003-12-01), Manakkal et al.

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