Browse Publications Technical Papers 2002-01-1753
2002-05-06

Development and Initial Use of a Heavy-Duty Diesel Truck Test Schedule for Emissions Characterization 2002-01-1753

In characterizing the emissions from mobile sources, it is essential that the vehicle be exercised in a way that reasonably represents typical in-use behavior. A heavy-heavy duty diesel truck (HHDDT) test schedule was developed from speed-time data gathered during two Air Resources Board-sponsored truck activity programs. The data were divided into four modes, termed Idle, Creep, Transient and Cruise Modes, in order of increasing speed. For the last three modes, speed-time schedules were created that represented all the data in that mode. Statistical parameters such as average speed, stops per unit distance, kinetic energy, maximum speed and acceleration and deceleration values were considered in arriving at these schedules. The schedules were evaluated using two Class 8 over-the-road tractors on a chassis dynamometer. Emissions were measured using a full-scale dilution tunnel, filtration for particulate matter (PM), and research grade analyzers for the gases. Test runs at different simulated weights showed that the weight influenced the ability of the truck to follow the trace closely. Emissions from Idle and Creep Modes were found to be variable due to varying auxiliary loads on the engine. A test protocol was developed for running the four modes in a sequence, and repeats of this whole sequence were performed to clarify test-to-test variability. For a test weight of 56,000 lbs. on a 400 hp 1995 Mack tractor, NOx emissions were 19.6 g/mile for the Transient Mode and 22.3 g/mile on the Cruise Mode, while the respective PM emissions were 0.56 g/mile and 0.14 g/mile. It was concluded that this test schedule of four modes was suitable for future HHDDT emissions characterization.

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

Models for Predicting Transient Heavy Duty Vehicle Emissions

982652

View Details

TECHNICAL PAPER

Emission Factors Evaluation in the RDE Context by a Multivariate Statistical Approach

2019-24-0152

View Details

TECHNICAL PAPER

Effects of the Real Driving Conditions on the NOx Emission of a Medium Duty Diesel Commercial Vehicle

2017-26-0124

View Details

X