As already mentioned at the beginning of the lesson, the exhaust emissions and fuel consumption of an engine are of great significance. These factors can only be minimized through precise operation of the injection system and comprehensive engine management strategies.
Consequently, the following requirements must be met by the common rail system:
• The injection timing must be exact. Even small variations have a significant effect on fuel consumption, exhaust emissions and combustion noise.
• The fuel injection pressure is independently adapted to all operating conditions.
• Injection must be terminated reliably. Calculation of the injected quantity and the injection timing is precisely adapted to the mechanical components of the injection system. Uncontrolled fuel dribble (for example, caused by a defective fuel injector) results in increased exhaust emissions and increased fuel consumption.
