Nowadays, downsizing is a major way to reduce fuel consumption and pollutant emissions of Spark Ignition (SI) engines. In downsized engines, new air path management systems such as turbocharging or Variable Camshaft Timing (VCT) are including, and an efficient control of the air actuators is required for engine torque control. Two non-linear estimators are proposed to estimate non-measured vari...

the effects of unleaded gasoline and unleaded gasoline–ethanol blends on engine performance and pollutant emissions were investigated experimentally in a single cylinder, four-stroke spark-ignition engine with variable engine speeds (2600–3500 rpm). four different blends on a volume basis were applied. these are e0 (0% ethanol + 100% unleaded gasoline), e3 (3% ethanol + 97% unleaded gasoline), ...

On February 24-26, 2014, the Coordinating Research Council (CRC) hosted a workshop at Hyatt Regency Baltimore, which focused on advanced fuel and engine efficiency. The workshop was co-sponsored by American Petroleum Institute (API) and U.S. Department of Energy (DOE). The main goal of the workshop was to understand the state of the art and identify gaps in current research efforts towards unde...

The application of hydrogen fuel in ORP engines makes the engine power density much higher than that a reciprocating engine. This paper investigated impacts combustion characteristics, energy loss, and NOx emissions hydrogen-fuelled by ignition timing over various equivalence ratios using simulation approach based on FLUENT code without considering experiments. simulations were conducted under ...

Abstract The objective of this paper is to investigate the possibility lowering pollution and improving characteristics a compression ignition engine for both stand-alone hybrid-electric powered vehicles. Due necessity output nitrogen oxides carbon monoxide emissions concentrations on engines, research focuses addition water injection. A benefit active cooling combustion increase boost pressure...

Two-stage ignition and NTC phenomenon in diesel sprays is investigated by performing 3-D two-phase reacting flow simulations in a dual-fuel engine. Spray processes modeled include fuel atomization, droplet distortion, droplet drag, turbulent dispersion, droplet interactions in terms of collision and coalescence, vaporization, and spray–wall interaction. A validated reaction mechanism is impleme...

We present a computational tool to develop an exhaust gas recirculation (EGR) – air-fuel ratio (AFR) operating range for homogeneous charge compression ignition (HCCI) engines. A single cylinder Ricardo E-6 engine running in HCCI mode, with external EGR is simulated using an improved probability density function (PDF) based engine cycle model. For a base case, the incylinder temperature and unb...

A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection velocity were examined. The mixing process and fo...