Audi Engine Management Systems

Online PDF Audi Engine Management Systems

The origins of Audi engine development can be traced back to a 1913 4-cylinder liquid-cooled engine designed by August Horch (1868-1951) in Zwickau, Germany. This great-grandfather of the modern Audi engine shared the same operating principles as the most modern 5-valve per cylinder water-cooled automotive engine. 
Both engines are four-stroke reciprocating internal combustion engines, and although a direct comparison cannot be made, the basic operating principles remain the same. 

Technology moved the four-stroke engine from magnetos and carburetors to ignition coils, points, distributors, mechanical fuel injection, hydraulic fuel injection, electronic ignition, electronic fuel injection, and finally to the combined fuel and ignition control of modern Motronic engine management systems. 

Motronic engine management systems use electronics to precisely monitor and control every aspect of engine operation, thereby improving efficiency, power, and driveability, while at the same time reducing fuel consumption and tailpipe emissions. 

Motronic engine management systems control engine operation so precisely that it is no longer possible to identify a separate emissions system. All functions previously identified as emissions system functions are now components of Motronic engine management. 

The intent of this program is to provide information that will yield a greater understanding of engine management systems commonly in use, and the progression leading to the newest Motronic ME 7 system. 

Course goals 

  1. review principles of engine operation explain the progression of engine management systems used by Audi 
  2. provide an in-depth understanding of both previous engine management systems and the state-of-the-art engine management systems in use today

Principles of engine operation Basic four-stroke principle
An internal combustion engine requires the proper ratios of air and fuel, combined with a properly timed spark for efficient combustion.

Operation of most automotive engines is described in two upward and two downward movements of the piston, called strokes. These four strokes occur during two revolutions of the crankshaft and one revolution of the camshaft. The complete process of cyclic external spark ignition resulting in internal combustion is called the fiOtto cycle.fl    
All four-stroke engines operate in the same manner, regardless of the number of cylinders, although an engine with multiple cylinders has more firing pulses, resulting in a smoother running engine.

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