Air path control of a spark ignition engine without an EGR loop, equipped with variable-valve-timing (VVT) actuators, is addressed in this paper. VVT devices are used to produce internal exhaust gas recirculation, providing beneficial effects in terms of fuel consumption and pollutant emissions reduction. However, VVT actuators affect the fresh air charge in the cylinders. This has an impact on...

The use of diesel engines has increased dramatically in recent years, as the number exhaust emissions. These emissions have potential to endanger Mother Nature and living species within it. Governments all over world introduced legislative rules on emission reduction order limit released into environment through global sustainable development technologies. This compelled automobile manufacturer...

Engine control center Legislators all over the world are specifying in­ creasingly tougher emissions limits for diesel engines. To comply with the requirements, emis­ sions from the drive system are constantly being reduced. As the engine’s brain, the engine man­ agement system (see Figure 1) controls key sys­ tems such as fuel injection, turbocharging and exhaust gas recirculation (EGR) that a...

An investigation into the isolability of the location of intake and exhaust manifold leaks in heavy duty diesel engines is presented. In particular, established fault detection and isolation (FDI) methods are explored to assess their utility in successfully determining the location of a leak within the air path of an engine equipped with exhaust gas recirculation and an asymmetric twin-scroll t...

To meet Euro VI emission targets for heavy-duty applications, truck manufacturers concentrate on Exhaust Gas Recirculation (EGR) and its combination with urea-based Selective Catalytic Reduction (SCR). TNO developed a concept that opens the route for an alternative solution which relies on SCR as the main technology for NOx abatement. This concept offers potential fuel benefits in combination w...

In this paper, a multivariable control strategy based on a parameterized Nonlinear Model Predictive Control (NMPC) approach is proposed for a Diesel engine air path. The aim is to control the level of pollutant emissions by coordinating the Exhaust Gas Recirculation (EGR) and the Variable Geometry Turbocharger (VGT) valves simultaneously. The main feature of the proposed controller lies in its ...

  This paper presents a modeling study of a CNG Homogenous Charge Compression Ignition (HCCI) engine using single-zone and multi-zone combustion models. Authors' developed code could be able to predict engine combustion and performance parameters in closed part of the engine cycle. As detailed chemical kinetics is necessary to investigate combustion process in HCCI engines, therefore, GRI-m...

An experimental study is carried out to investigate engine performance parameters and methods of reducing emissions from spark ignition engine. The used engine is four stroke four cylinder naturally aspirated spark ignition engine with compression ratio of 9, bore diameter of 80 mm and stroke of 90 mm. The engine performance parameters are presented with and without exhaust gases recirculation ...

current approaches to the analysis of internal combustion engines are no longer merely based on the first law of thermodynamics and are conducted from the second law either. the evaluation of processes by the first law cannot provide a sophisticated insight into the issue. so, due to the necessity of having a detailed perspective of the losses in different thermodynamic processes, a useful meth...

With the rapid technological progress of society and increasingly stringent environmental regulations, further reduction emissions has become an important issue for protection. This study developed a response surface model with biodiesel blending ratio (BBR), load, exhaust gas recirculation (EGR) as independent variables brake thermal efficiency (BTE), specific fuel consumption (BSFC), NO x , C...