Results 181 to 190 of about 4,123 (231)

The Effects of In-Cylinder Flow Fields and Injection Timing on Time-Resolved Hydrocarbon Emissions in a 4-Valve, DISI Engine

SAE Technical Paper Series, 2000
<div class="htmlview paragraph">Direct injection spark-ignition (DISI) engines have been shown to have much higher engine-out hydrocarbon emissions (HC) than port fuel injected (PFI) engines. A major contribution to the increase in HC emissions is from the in-cylinder surface wetting that occurs as the fuel is injected.
Terrence Alger, Matthew Hall, Ronald D. Matthews   +2 more
openaire   +1 more source

NOx and Fuel Economy Challenges With EMD Two-Stroke Engines: Variable Injection and Valve Timing

ASME 2009 Internal Combustion Engine Division Fall Technical Conference, 2009
NOx emissions are a major cause of ozone formation. Several technologies to mitigate NOx in internal combustion engines have been developed, both in-cylinder and aftertreatment. Some of these newer technologies are being implemented on new engines, but older engines, especially large diesel engines, have few options to reduce these emissions ...
Michael B. Riley, John C. Hedrick
openaire   +1 more source

Brake Valve Timing and Fuel Injection: a Unified Engine Torque Actuator for Heavy-Duty Vehicles

Vehicle System Dynamics, 2001
A unified engine torque actuator for heavy-duty vehicles is developed in this paper. Based on averaging and identification of the instantaneous torque response for changes in brake valve timing and fuel flow, we derive a control oriented engine model of a six cylinder, 350 Hp turbocharged diesel engine, equipped with a compression brake.
Maria Druzhinina, Anna Stefanopoulou, Lasse Moklegaard   +2 more
openaire   +1 more source

Intake and Exhaust Valve Timing Control on a Heavy-Duty, Direct-Injection Natural Gas Engine

SAE Technical Paper Series, 2015
<div class="section abstract"><div class="htmlview paragraph">Natural gas high pressure direct injection (HPDI) engines represent a technology with the potential for lower engine-out emissions and reduced fuel costs over a diesel engine. This combustion process uses a direct injection of natural gas, into the combustion chamber of a high ...
Bronson Patychuk, Ning Wu, Gordon McTaggart-Cowan, Philip Hill, Sandeep Munshi   +4 more
openaire   +1 more source

Effect of Fuel Injection Timing During Negative Valve Overlap Period on a GDI-HCCI Engine

Volume 1: Large Bore Engines; Fuels; Advanced Combustion, 2018
Gasoline Direct Injection Homogeneous Charge Compression (GDI-HCCI) combustion is achieved by closing early the exhaust valves for trapping hot residual gases combined with direct fuel injection. The combustion is chemically controlled by multi-point auto-ignition which its main combustion phase can be controlled by direct injection timing of fuel ...
Sok Ratnak, Jin Kusaka, Yasuhiro Daisho, Kei Yoshimura, Kenjiro Nakama   +4 more
openaire   +1 more source

Effects of thermal barrier coating on gas emissions and performance of a LHR engine with different injection timings and valve adjustments

Energy Conversion and Management, 2006
Abstract Tests were performed on a six cylinder, direct injection, turbocharged Diesel engine whose pistons were coated with a 350 μm thickness of MgZrO3 over a 150 μm thickness of NiCrAl bond coat. CaZrO3 was employed as the coating material for the cylinder head and valves.
Sakarya Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü, Büyükkaya, Ekrem, Engin, Tahsin, Cerit, Muhammet, Büyükkaya, Ekrem   +4 more
openaire   +1 more source

Effects of EGR, Variable Valve Timing, High Turbulence and Water Injection on Efficiency and Emissions of a HD Stoichiometric Natural Gas Engine

SAE Technical Paper Series, 2021
<div class="section abstract"><div class="htmlview paragraph">The EU recently decided to reduce CO₂ emissions of commercial vehicle fleets by 30% until 2030. One possible way to achieve this target is to convert commercial vehicle diesel engines into stoichiometric natural gas engines.
Marius Betz, Nico Höweling, Ulf Kühne, Peter Eilts   +3 more
openaire   +1 more source

The effect of injection timing and intake valve close timing on performance and emissions of diesel PCCI engine with a full engine cycle CFD simulation

Applied Energy, 2011
Abstract A full-cycle computational fluid dynamics (CFD) simulation coupled with detailed chemical kinetics mechanism has been used to investigate the effect of start of injection (SOI) timing and intake valve close (IVC) timing on performance and emissions of diesel premixed charge compression ignition (PCCI) engine.
Ming Jia, Maozhao Xie, Tianyou Wang, Zhijun Peng   +3 more
openaire   +3 more sources

Understanding the infiuence of valve timings on controlled autoignition combustion in a four-stroke port fuel injection engine

Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2005
Controlled autoignition (CAI) combustion, also known as homogeneous charge compression ignition (HCCI), was achieved through the negative valve overlap approach by using small- lift camshafts. Three-dimensional multicycle engine simulations were carried out in order better to understand the effects of variable intake valve timings ...
Cao, L, Zhao, H, Jiang, Xi, Kalian, N
openaire   +1 more source

Mid-ranging control of a multi-cylinder HCCI engine using split fuel injection and valve timings

IFAC Proceedings Volumes, 2010
Abstract Homogeneous charge compression ignition (HCCI), though a promising piston-engine strategy for the future, presents a significant control challenge due to the presence of cycle-to-cycle dynamics and the absence of a direct combustion trigger.
Nikhil Ravi, Hsien-Hsin Liao, Adam. F. Jungkunz, J. Christian Gerdes   +3 more
openaire   +1 more source