A Hybrid Combustion Control Strategy for Heavy Duty Diesel Engines Based on the Technologies of Multi-Pulse Injections, Variable Boost Pressure and Retarded Intake Valve Closing Timing

2011 ◽  
Author(s):  
Wenbin Yu ◽  
Bin Liu ◽  
Yang Li ◽  
Qingpeng Su ◽  
Yiqiang Pei ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Control Strategy ◽  
Boost Pressure ◽  
Combustion Control ◽  
Intake Valve ◽  
Heavy Duty ◽  
Heavy Duty Diesel

Extreme Miller cycle with high intake boost for improved efficiency and emissions in heavy-duty diesel engines

2021 ◽  
pp. 146808742110593
Author(s):  
Erick Garcia ◽  
Vassilis Triantopoulos ◽  
Joseph Trzaska ◽  
Maxwell Taylor ◽  
Jian Li ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Diesel Engines ◽  
Combustion Process ◽  
Valve Train ◽  
Miller Cycle ◽  
Intake Valve ◽  
Heavy Duty ◽  
High Intake ◽  
Heavy Duty Diesel ◽  
The Impact

This study experimentally investigates the impact of extreme Miller cycle strategies paired with high intake manifold pressures on the combustion process, emissions, and thermal efficiency of heavy-duty diesel engines. Well-controlled experiments isolating the effect of Miller cycle strategies on the combustion process were conducted at constant engine speed and load (1160 rpm, 1.76 MPa net IMEP) on a single cylinder research engine equipped with a fully-flexible hydraulic valve train system. Late intake valve closing (LIVC) timing strategies were compared to a conventional intake valve profile under either constant cylinder composition, constant engine-out NOx emission, or constant overall turbocharger efficiency ([Formula: see text]) to investigate the operating constraints that favor Miller cycle operation over the baseline strategy. Utilizing high boost with conventional intake valve closing timing resulted in improved fuel consumption at the expense of sharp increases in peak cylinder pressures, engine-out NOx emissions, and reduced exhaust temperatures. Miller cycle without EGR at constant [Formula: see text] demonstrated LIVC strategies effectively reduce engine-out NOx emissions by up to 35%. However, Miller cycle associated with very aggressive LIVC timings led to fuel consumption penalties due to increased pumping work and exhaust enthalpy. LIVC strategies allowed for increased charge dilution at the baseline NOx constraint of 3.2 g/kWh, resulting in significant fuel consumption benefits over the baseline case without compromising exhaust temperatures or peak cylinder pressures. As Miller cycle implementation was shown to affect the boundary conditions dictating [Formula: see text], the LIVC and conventional IVC cases were studied at an equivalent [Formula: see text] point representative of high boost operation. With high boost, LIVC yielded reduced NOx emissions, reduced peak cylinder pressures, and elevated exhaust temperatures compared to the conventional IVC case without compromising fuel consumption.

scholarly journals Particulate emissions of heavy duty diesel engines measured from the tailpipe and the dilution tunnel

2021 ◽  
pp. 105799
Author(s):  
Sheng Su ◽  
Tao Lv ◽  
Yitu Lai ◽  
Jinsong Mu ◽  
Yunshan Ge ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Particulate Emissions ◽  
Heavy Duty ◽  
Heavy Duty Diesel

Development of Ceramic Coated Exhaust Manifolds for Heavy Duty Diesel Engines

1991 ◽  
Author(s):  
K. Itoh ◽  
K. Ohtsuka ◽  
T. Nagata ◽  
M. Nakamizo ◽  
K. Morikawa ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Heavy Duty ◽  
Heavy Duty Diesel
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