Evaluation and Modeling of Soot Emissions under Real-World Driving Conditions of an Ultra-Low NOx Tier 3 Bin 125 Light-Duty Diesel Pickup Truck Awty International School

Format:

Book

Conference/Event

Author/Creator:

Huang, Rick, author.

Contributor:

Matthews, Ron

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Currently, light-duty Diesel engines are facing great challenges to meet more stringent EPA emissions regulations while achieving above 30 miles/gallon fuel economy and maintaining a relatively low cost for the NOx and soot aftertreatment systems. This paper focused on one aspect of this challenge, which is how soot emissions in real-world driving was controlled and the impact soot control had on the fuel economy. The test vehicle used was a LDT2 MY2018 General Motors Chevrolet Colorado Diesel pickup truck certified to the EPA Tier 3 Bin 125 emissions standards. Real-time engine-out soot emissions and engine control parameters were measured for selected urban and highway routes. An engine-out soot model was developed and verified with the extensive real-world driving data, which is important for DPF soot load estimation, DPF efficiency diagnosis, as well as evaluation of the impacts on fuel economy and emissions under real-world driving conditions. Our study found that while NOx emissions were well controlled during both urban and highway driving, soot emissions from urban driving were twice as much as those from highway driving. During urban driving, soot emissions stemmed mostly from take-off, hard acceleration, and low-speed driving, while during highway driving, soot emissions came mainly from hard acceleration. Under urban driving, the root cause of high soot emissions during take-off and acceleration was over-fueling with insufficient oxygen. At low speeds, high EGR was the main cause of high soot emissions, when EGR was needed to control NOx because SCR is less effective at lower temperatures

Notes:

Vendor supplied data

Publisher Number:

2021-01-0504

Access Restriction:

Restricted for use by site license