Civil and Environmental Engineering Publications
Analysis and modeling of the thermal soak phase of a vehicle - Temperature and heat flux measurements
Document Type
Article
Publication Date
2015
Journal
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
Volume
16
Issue
2
First Page
221
URL with Digital Object Identifier
https://doi.org/10.1007/s12239-015-0024-3
Last Page
229
Abstract
The thermal soak phase of a vehicle results from driving the vehicle at high load followed by shutting off the engine. The present work deals with the analysis and modeling of the thermal soak phase of a vehicle through temperature and heat flux measurements. Measurements are carried out on a passenger vehicle in wind tunnel S4 of Saint-Cyr-France. The underhood is instrumented by alsmot 120 surface and air thermocouples and 20 fluxmeters. Measurements are performed for three thermal functioning conditions, with the engine in operation and the front wheels positioned on the test facility with power-absorption controlled rollers. It was found that in thermal soak the temperature of certain components can increase by almost 80A degrees C (pre-catalyst) and that of air zones by alsmot 40A degrees C (crawl area). These components correspond to areas that heat up after stopping the engine for 3 to 24 minutes, depending on their position in the underhood and on the thermal operating point considered.