Browse Publications Technical Papers 2017-01-1065
2017-03-28

Virtual Exhaust Gas Temperature Measurement 2017-01-1065

Exhaust temperature models are widely used in the automotive industry to estimate catalyst and exhaust gas temperatures and to protect the catalyst and other vehicle hardware against over-temperature conditions. Modeled exhaust temperatures rely on air, fuel, and spark measurements to make their estimate. Errors in any of these measurements can have a large impact on the accuracy of the model. Furthermore, air-fuel imbalances, air leaks, engine coolant temperature (ECT) or air charge temperature (ACT) inaccuracies, or any unforeseen source of heat entering the exhaust may have a large impact on the accuracy of the modeled estimate. Modern universal exhaust gas oxygen (UEGO) sensors have heaters with controllers to precisely regulate the oxygen sensing element temperature. These controllers are duty cycle based and supply more or less current to the heating element depending on the temperature of the surrounding exhaust gas. This paper proposes and analyzes a method for using the UEGO heater controller duty cycle to measure exhaust gas temperature at no incremental cost. The analysis shows that such a method can provide an accurate measurement of exhaust gas temperature both in nominal dynamic drive conditions and in the presence of an exotherm from unmodelled sources.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Sensing Performance for Low NOx in Exhausts with NOx Sensor Based on Mixed Potential

2000-01-1203

View Details

TECHNICAL PAPER

Non–Ideal Properties of ZrO2 and TiO2 Exhaust Gas Oxygen Sensors

800018

View Details

TECHNICAL PAPER

Exhaust Gas Temperature Determination with HEGO Parameters

2010-01-1303

View Details

X