Once Upon a Time Diesel Engines

14th Oct 11 11:40<< Go back to news

Once Upon a Time Diesel Engines

Once upon a time diesel engines automobiles, where inclined to be “noisy” and “sluggish”,  in complete contrast today’s  diesels use highly sophisticated engine managements systems to control emissions and provide a performance level equal to and in many cases better than some of today’s petrol powered alternatives.

We have moved away from mechanical controlled systems, to electronic control EDC, common rail injector systems (which incorporate accumulator rails) and injectors controlled by solenoids or electronic piezo injectors and emission additive systems such as “adblue” to reduce emissions. 

With common rail and piezo injectors engine speed has been separated from pressure generation, this helps create quieter and more economical diesels.. for example at low speed common rail provides higher injection pressures resulting in better combustion processes and reducing black smoke. The piezo injectors can divide the injection cycle into as many as five separate injection events, each specially timed to maximize combustion efficiency. This not only improves economy and lowers emissions, but it also reduces noise.

Common rail systems encompass electronic control, sensors and actuators as well as a high pressure fuel pump. Exhaust gases leave the engine and pass through the Diesel Oxidation Catalyst (DOC), which reduces the carbon monoxide Co and unburned hydrocarbons. Next is the NOx Absorber Catalyst, or NAC, which removes and traps oxides of nitrogen (NOx is one of the chief elements in diesel pollution). During periods of lean operation (low fuel-to-air ratio) NOx is stored; under richer operating conditions (which can be created by manipulating the fuel injection) the NAC undergoes a regeneration process and releases ammonia into the exhaust. The ammonia is stored downstream in the Selective Catalytic Reduction (SCR) catalyst which uses it to further reduce NOx. In between the NAC and SCR catalysts is a particulate filter that traps particulate emissions (soot). As the particulate filter becomes full, the engine management system manipulates the fuel injection process to raise the exhaust gas temperature, which in turn burns off the particulates. 

If this has ignited your interest then see our range of bosch diesel courses http://autoeducation.co.uk/courses/diesel-systems, course are between 1-3 days and cost between £150- £450 (not inclu BCS discount)

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