scholarly journals Development of Thermal Management Strategies Using Cylinder Deactivation for Low-Load Operation in Heavy-Duty Diesel Trucks

2021 ◽  
Author(s):  
Christian M Hushion
Keyword(s):  
Thermal Management ◽  
Management Strategies ◽  
Heavy Duty ◽  
Cylinder Deactivation ◽  
Low Load ◽  
Heavy Duty Diesel ◽  
Diesel Trucks

In-Use Performance and Durability of Particle Filters on Heavy-Duty Diesel Trucks

2018 ◽  
Author(s):  
Chelsea V. Preble ◽  
Troy E. Cados ◽  
Robert A. Harley ◽  
Thomas W. Kirchstetter
Keyword(s):  
Particle Filters ◽  
Heavy Duty ◽  
Heavy Duty Diesel ◽  
Diesel Trucks

On-road emission measurements of reactive nitrogen compounds from heavy-duty diesel trucks in China

2020 ◽  
Vol 262 ◽  
pp. 114280 ◽  
Author(s):  
Liqiang He ◽  
Shaojun Zhang ◽  
Jingnan Hu ◽  
Zhenhua Li ◽  
Xuan Zheng ◽  
...  
Keyword(s):  
Reactive Nitrogen ◽  
Nitrogen Compounds ◽  
Heavy Duty ◽  
Heavy Duty Diesel ◽  
Diesel Trucks ◽  
Road Emission

Analysis and optimization of a variable mode valve actuation system

2020 ◽  
pp. 146808742090599
Author(s):  
Yang Wang ◽  
Jingchen Cui ◽  
Xiangyu Meng ◽  
Jiangping Tian ◽  
Hua Tian ◽  
...  
Keyword(s):  
Thermal Management ◽  
Flow Rate ◽  
Outlet Temperature ◽  
Brake Specific Fuel Consumption ◽  
Cylinder Pressure ◽  
Heavy Duty ◽  
Cylinder Deactivation ◽  
Actuation System ◽  
Variable Mode ◽  
Valve Actuation

Braking safety of heavy-duty engines has always been the focus of the research, and the fuel economy and after-treatment thermal management during low-load operation of heavy-duty engines have also received much attention in recent years. A variable mode valve actuation system which can realize switching between four-stroke driving, two-stroke compression release braking and cylinder deactivation modes on a traditional four-stroke engine was proposed in this article. Two-stroke compression release braking mode of the variable mode valve actuation system can greatly enhance the braking safety, while the overload of valve train was a great challenge, especially during the release event. The effects of different release opening timing on cylinder pressure and the braking performance were studied. The results indicated that a higher cylinder pressure does not always lead to higher braking power. When the release opening timing was advanced by 6 °CA, the braking power reduced by only 9 kW (2.65%) at 1900 r/min compared with the initial value, while the maximum cylinder pressure reduced by 11.4 bar (20.8%). Besides, the variable mode valve actuation system can realize alternate three-cylinder cylinder deactivation mode on a six-cylinder turbocharged engine, which can improve the brake-specific fuel consumption by 14.67% and increase the turbine outlet temperature by 63.6 °C and reduce the exhaust flow rate by 50.66% at lightly load idle. Meanwhile, when the engine load is less than 50% at the rated speed, the three-cylinder cylinder deactivation mode can improve the brake-specific fuel consumption, increase the turbine outlet temperature and reduce the exhaust flow rate. The increase of the turbine outlet temperature and the decrease of the exhaust flow rate are very beneficial to improve the efficiency of the after-treatment thermal management of heavy-duty engines.

Emissions Characteristics for Heavy-Duty Diesel Trucks Under Different Loads Based on Vehicle-Specific Power

2017 ◽  
Vol 2627 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Shuanghong Zhang ◽  
Lei Yu ◽  
Guohua Song
Keyword(s):  
Carbon Dioxide ◽  
Travel Speed ◽  
Specific Power ◽  
Oxides Of Nitrogen ◽  
Heavy Duty ◽  
Operating Modes ◽  
Vehicle Loads ◽  
Heavy Duty Diesel ◽  
Diesel Trucks ◽  
The Impact

Both operating modes and emissions factors for heavy-duty diesel (HDD) trucks were analyzed under different loads to understand the effect of vehicle loads on emissions. Second-by-second speed data for different loads for HDD trucks were collected first. Then a method for calculating the vehicle-specific power (VSP) values and an emissions model for heavy-duty vehicles by using the VSP value were developed to evaluate the effect of different vehicle loads. The VSP distributions and emissions characteristics for fully loaded and unloaded trucks were analyzed and compared. The results illustrate that the fully loaded vehicles spent more time driving in steady modes and the time percentage of VSP values in the bin of 0 kW/ton for fully loaded trucks was lower than the percentage for unloaded trucks. However, the time percentage at the positive VSP value was significantly higher than the percentage for the unloaded trucks. The emissions factors of fully loaded trucks were significantly higher than those of unloaded trucks. Emissions factors were affected the most at speed intervals of 20 to 40 km/h, with emissions factors for carbon dioxide, carbon monoxide (CO), oxides of nitrogen (NOx), hydrocarbon, and particulate matter (PM) at 20.4%, 23.5%, 29.0%, 11.7%, and 9.4% higher, respectively, than those levels for unloaded vehicles. With an increase of travel speed, the impact of the load on emissions weakened. Vehicle loads had the greatest effect on emissions of NOx, followed by emissions of CO. PM emissions were the least affected by vehicle loads. The impact of vehicle loads on emissions was affected by different acceleration behaviors under different loads.

Correction to Verifying Emission Reductions from Heavy-Duty Diesel Trucks Operating on Southern California Freeways

2014 ◽  
Vol 48 (15) ◽  
pp. 8933-8933 ◽  
Author(s):  
Kathleen H. Kozawa ◽  
Seong Suk Park ◽  
Steven L. Mara ◽  
Jorn D. Herner
Keyword(s):  
Southern California ◽  
Heavy Duty ◽  
Emission Reductions ◽  
Heavy Duty Diesel ◽  
Diesel Trucks
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