Introduction 1 - engine management on diesel engines

Úvod

Electronic control of diesel engines (EDC) was introduced later compared to petrol engines. The reason for introducing electronics was to reduce the amount of diesel particles, fuel consumption and increase engine power.
The first electronically controlled indirect injection system was introduced in 1986. 

Mechanical, pneumatic and hydraulic regulators were replaced with electrical components (actuators), that are controlled electronically based on input values (from speed sensors, airflow, temperature, etc.).


How electronics can improve the diesel engine parameters and reduce harmful emissions?
For ideal combustion it is required that the fuel has a good spray pattern, at the correct time and for the exact time duration. By introducing quick and precise electronics it was possible to modify fuel injectors, combustion chambers, intake ports, turbochargers, exhaust gas recirculation and other engine components that have influence on emissions, fuel consumption and engine power.

The individual passenger vehicle EDC systems can be divided into:

• electronic regulation system based on classic injection pumps
• in-line injection pumps
• distributor injection pumps with axial pistons
• distributor injection pumps with radial pistons
• unit injector systems (PDE)
• electromagnetic valve determines the point and duration of the mechanical diesel compression inside the injector (closing and opening of the return fuel line)
• introduction of piezo operated injectors
• system CommonRail (CR)
• high pressure fuel feed to injectors, electromagnetic valve hydraulicly controls the injector pintle
• introduction of piezo operated injectors

Development of electronics

• 1986 - electronicly controlled injection
• 1989 - direct diesel fuel injection on passenger cars
• 1990 - introduction of catalytic converters
• 1996 - distributor fuel injection pumps with electronic governors
• 1997 - CommonRail system
• 1998 - Unit injectors (PDE)
• 2000 - diesel particle filter
• 2004 - CommonRail diesel with piezo injectors
• 2006 - Piezo Unit injectors

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