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Diesel Engines Performances - Level 1

2 days MOT/PMD1-E
  • Engineers and technical staff working in relation with engine departments and needing to know the vocabulary, the physics fundamentals and the main technologies of Diesel engines.
  • To provide participants with improved knowledge of the heavy duty truck engines performances, design and development: basic sizes, combustion, injection systems, supercharging, fuels and lubricants.
Learning Objectives
  • To know the definition and the use of parameters used in the engine design and development.
  • To understand the physics that lead to pollutants formation (PM, NOx, HC, CO) and the physics of the technologies aimed at reducing the pollutants (injection, swirl, exhaust gas recirculation, advance).
  • To understand the technologies of the injection systems used.
  • To know turbochargers’ operating principles and the way to match them to an engine.
Ways and means
  • The fundamentals of Diesel engines in a funny and easy way for a better and reliable understanding.

Efficiency and performances 0.5 day
  • Power, torque, mean effective pressure, piston mean velocity: situation of heavy truck engines compared with the other spark ignition or Diesel engines.
  • Volumetric efficiency, influence on performances.
  • Engine efficiencies: global efficiency, combustion efficiency, thermo-dynamic efficiency, cycle type efficiency, organic efficiency. How tuning affects the different efficiencies. Specific consumption. Thermal balance.
Diesel combustion and injection 1 day
  • Diesel combustion mechanism. Pollutants formation: PM, NOx, HC, CO. Representation on Pischinger diagram.
  • Different combustion phases: auto-inflammation delay, pre-mixture combustion, diffusion flame combustion. Combustion-related noise. Fuel cetane number.
  • Combustion system: swirl definition, measurement and generation; fuel-jet characteristics: introduction rate, penetration, atomization, external form; piston combustion chamber.
  • Technology of the different injection systems: injectors-pumps, unit pumps, common-rail, Caterpillar system.
  • Exhaust gas recirculation: how it acts on nitrogen oxides reduction, interest of EGR cooling, development technologies.
  • New Diesel combustion processes (HCCI).
Fuels - Lubricants 0.25 day
  • Fuel production in refineries. Diesel fuel main characteristics in relation with the use of engine: cetane, cold engine operability, distillation, lubrication capacity.
  • Lubricant main required properties.
Supercharging 0.25 day
  • Turbocharger operating principle.
  • Choosing a turbocharger to match a given engine.
  • Variable geometry turbocharger, twin scroll turbocharger.