Diesel Engines Performances - Level 2MOT/PMD2-E

Who should attend?

  • This course provides a deeper knowledge on Diesel engines and their related fields: pollution, fuels, lubricants, engine design, evolution of injection and supercharging technologies.
Audience :
  • Engineers and technical staff working on performances tuning of road truck engines.

Level : Advanced

Course Content

  • Atmospheric pollution & regulations

      • Atmospheric pollution, main impacts on health, share of transports.
      • Pollutants emitted by engines (regulated and non regulated). Regulations related to the vehicles exhaust emissions.
  • Efficiency & performances

      • Global efficiency, combustion efficiency, thermo-dynamic efficiency, cycle type efficiency, mechanical efficiency.
      • Thermal balance.
      • Loading and volumetric efficiency.
  • Lubricant

      • Engine oils SAE viscosity classification. Diesel engine oils EPI and ACEA classifications.
      • Problems of the diesel and engine and the lubrication: lubricant behavior with the soot (dispersion); fuel sulfur content (TNB and ashes content); cylinder resurfacing; lubricant compatibility with after-treatment systems (DPF).
      • Oil filtration. Follow-up of in-service lubricants.
  • Diesel fuel

      • Production in refineries, manufacturing constraints in Europe and in the US.
      • Characteristics related to the use on engine: cetane, cold engine operability, distillation, viscosity, sulfur content.
      • Specifications: Fuel diesel in Europe, fuel Diesel in US, fuel for building machines, for boats.
  • Diesel combustion & injection

      • Pollutants formation: HC, CO, NOx, particles, depending on temperature and the air-fuel ratio in the combustion chamber.
      • Fuel jet formation and characterization in the chamber. Role of swirl.
      • Influence of engine parameters on emissions, consumption, noise: load, injection advance, exhaust gas recirculation (internal, external, cooling), swirl, injection pressure. Examples of some test results interpretation.
      • Diesel injection system operating: injectors-pumps, solenoid common-rail, piezo, with pressure amplification.
      • Information about variable timing systems interest and technology.
  • After-treatment

      • Oxidation catalysts. Diesel particulates filter (DPF).
      • Selective reduction Catalyst (SCR) using urea. Other systems.
  • Supercharging

      • Turbochargers operating principle: compression and expansion energies, geometric characteristics, flow adjustment, cooling.
      • Compressor pressure-flow map and operating limits (pumping, speed, efficiency).
      • Turbine characteristics, saturation.
      • Technologies of the turbocharger different parts: materials, lubrication, reliability aspects.
      • Twin-scroll, variable geometry, dual supercharging turbochargers.
      • Matching a turbocharger to an engine: choice of the compressor and of the turbine depending on the engine characteristics and performances.
      • Participants will carry out a practical exercise of turbocharger adaptation.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • take in account the environmental situation that explains the regulations related to exhaust emissions,
  • better understand combustion and diesel injection physics, the efficiency and performances improvement parameters,
  • master the fuel and lubricant specifications and impacts on the engine’s operation,
  • size a turbocharger and match it to an engine,
  • choose a depollution strategy and to select an after-treatment system,
  • understand the operating principles and the strategies associated to the engine management.

Ways & Means

  • MOT/PMD1-E + MOT/PMD2-E give a full overview of the field of Diesel truck engines, through interactive talks and numerical exercises.