3 days MOT/MOT3-E
- Engineers and technical staff of engine design, development or tuning departments, Diesel engines. For improved comprehension, applicants are advised to initially follow the Module 1.
- This course provides technical knowledge on Diesel engines for cars and industrial vehicles.
- Upon completion of the course, participants will be able to:
- know how direct injection Diesel engines work: ignition physics, design and adjustment parameters optimization,
- know high pressure injection systems operation and evolution,
- understand how Diesel fuel characteristics affect the engine behavior,
- select a depollution strategy and an after-treatment system,
- match a turbocharger with an engine.
- Module 1 "MOT/MOT1-E" training.
Ways and means
- Lecturers are industry experts, delivering real life examples.
The Diesel Engineers course (page 33) may replace module 3 for participants who wish to have a 5-day enhanced version.
Combustion system optimization 1 day
- Pollutants formation mechanisms
- Formation conditions of particles, nitrogen oxides, unburnt hydrocarbons, carbon monoxide. Representation in a temperature-air/fuel ratio diagram. Influence of injection pressure, swirl, injection advance parameters.
- Fuel jet gas and liquid parts behaviors.
- Combustion system optimization
- Streamline inlet: swirl roles and measurement; trade-off with cylinder head tightness.
- Drawing of the cavity (bowl) machined in the piston head.
- Injection system required qualities.
- Combustion noise. Advantage of multiple injections.
- Exhaust gas recirculation (EGR)
- How it reduces nitrogen oxide rate. Interest of EGR cooling.
- High and low pressure EGR.
- Start and cold start
- Combustion deterioration factors causing fumes and noise.
- Structure and control strategy of glow plugs used on car engines.
Supercharging 0.5 day
- Turbocharger operating and technology.
- Turbocharger adaptation process on an engine: determining the flow and the density in the intake manifold, choosing the supercharger, calculating the flow and the turbine expansion ratio, choosing the turbine.
- Fixed or variable geometry turbocharger (FGT or VGT), supercharging by two sequential turbochargers.
Compression ignition engine fuel characteristics 0.5 day
- Diesel fuel main characteristics and specifications (density, cetane rating, viscosity, lubricating capacity, volatility, sulfur, …) and impact on the engine behavior, additive properties.
- Impact of the fuel composition on the regulated and non regulated pollutant emissions.
- Biofuels: vegetable oil esters.
Injection system technology & monitoring 0.5 day
- Common-rail injection system: system description; systems evolution.
- High pressure pump; high and low rail pressure control.
- Fuel injector operating; flow in the injector nozzle, hydraulic flow.
- Rail technology; flow balance.
Exhaust gas after-treatment 0.5 day
- Regulations evolution, depollution strategies.
- Oxidation catalysis: efficiency, initiation temperature, sulfur effect, positioning in the exhaust line.
- Nitrogen oxides after-treatment: NOx traps, selective reduction catalyst (SCR).
- Diesel particles after-treatment: Diesel particle filter (DPF); DPF regeneration with additives in the fuel or by filter catalytic coating; associated engine monitoring strategy.