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Technical Evolutions of Automotive Engines

MOT/ETMA-E
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Who should attend?

  • This course provides a deeper knowledge on technical evolutions of the current automotive engines, both SI and Diesel ones and provides an overview of the current drivers of engine design: emissions and fuel consumption.
Audience :
  • Engineers and technical staff already aware of engine fundamentals and looking for an update of engines’ technical evolutions.

Level : Foundation

Course Content

  • Gasoline combustion concepts & modes, direct injection & downsizing

      • Gasoline direct injection (GDI)
      • IDE advantages and drawbacks, strategies of use (R=1, stratified, …).
      • Two main groups of combustion chambers.
      • System characteristics: injectors, HP pump, regulator, rail, electronic power unit.
      • Examples of achievements.
      • Downsizing
      • Situation, stakes, consumption increase origin, difficulties to manage.
      • Supercharging system specifications, different types of supercharging.
      • Interest of coupling GDI with supercharging.
      • Knocking management.
      • Advantage of variable timing.
      • CAI (Controlled Auto Ignition): principle, interest and limits.

  • Diesel combustion system

      • Common rail Diesel direct injection
      • Evolutions leading to direct injection and common rail injection system globalization.
      • Parameters driving the Diesel engine maximum performances.
      • Interactions between different technologies in Diesel engines and the performances making it possible to reach them.
      • Exhaust gas after-treatment: Diesel exhaust gas after-treatment principles.
      • HCCI (Homogeneous charge compression ignition): operating and conditions, interest, limits in high load and during transients.

  • Variable timing system

      • Timing role and restrictions, interest of variable timing.
      • Camshaft phase shifter, dual cam systems (Honda VTEC, Porsche Variocam, Mahle), continuous variation systems (Valvetronic BMW, Toyota Valvematic system, Nissan VVEL, Multiair Fiat). Camless system.
      • Application to Miller/Atkinson systems.

  • Supercharging

      • Turbocharger role, restrictions and dimensioning.
      • Turbocharger technology evolution in relation to the engine evolutions: restrictions related to pressure increase and ignition temperatures (downsizing), interest of the dual inlet turbine (Twin Scroll).
      • Response lag optimization: main bearings or roller bearings, compressor pre-launch by coupling, volumetric compressors.
      • Evolutions: variable nozzle geometry (VNT), coupled turbochargers (serial or parallel), “e-Boosting”.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • recognize and understand direct injection SI engines operation,
  • know the advantages of downsizing in gasoline spark ignition engines,
  • recognize and understand the Diesel issues and evolutions,
  • know new ignition modes (CAI and HCCI),
  • know timing adaptations and new ignition modes,
  • know supercharging technology evolutions.

Ways & Means

  • A complete overview presented by experienced engineers or industry project leaders.
  • Focus on engine design drivers. Ranking of design constraints.