Method and system for detecting the absence of under engine protection
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United States of America
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Mar 24, 2020
Grant Date -
Jul 11, 2019
app pub date -
Jun 30, 2017
filing date -
Jun 30, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A method for diagnosing the absence of an under-engine protection of a motor vehicle, includes: estimating a temperature of air external to the vehicle, estimating an under-hood temperature, determining whether the external-air temperature value is below the under-hood temperature value, in the affirmative, calculating an absolute value of a difference between the external-air temperature measurement and the under-hood temperature measurement, determining a diagnostic criterion by calculating a difference between the absolute value and a predetermined absolute value, obtained in the presence of the under-engine protection, comparing the diagnostic criterion against a predetermined diagnostic threshold, and emitting a diagnostic signal dependent on the result of the comparison.
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