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advances in diesel technology could forever change the way we perceive
diesels. Diesel vehicles have always been considerably cheaper to run due
to the MPG as opposed to petrol driven, which goes a long way to explaining why both the French and German
manufacturers consistently produce the best diesel engines known as the "Common-Rail" engines
which are the new breed of diesel engines with the OBD "onboard
diagnostics" and
within a few years every car maker will feature them. Many VW group
engines already feature the technology, as do Citroen and Peugeot HDi
engines, with Ford to follow suit shortly. Diesel engines can be quite noisy and unrefined because a mechanical pump is used to pump diesel into the cylinders and, especially when cold, it emits the traditional diesel clatter. To overcome this problem engineers dispensed with the mechanical pump and instead used an electric device which is capable of compressing the fuel to 40,000 psi. To give you an idea of the kinds of pressure involved, most cars tyres are inflated to just 30 psi or so. This pressurised diesel is then pumped into a single tube which has computer controlled valves in it. These valves are opened for a fraction of second and the perfect amount of diesel is released into the cylinder at exactly the right moment, producing super efficient combustion. This single tube is the 'common-rail' to which the name refers, because one rail can service all the cylinders where previously each cylinder had to have its own injector. Not only are 'common-rail' diesel engines more fuel efficient, powerful and less polluting, they no longer rattle like old tractors and they even sound sporty. If you've never been a fan of diesel engines before then prepare for a shock. Incidentally I was working on diesel engines more than 30 odd years ago when the similar device was used like the "common rail", the engine then was used in vehicles, known as the Cummins Engine, how history repeats itself. Signed Jim 18/8/02 |
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Bosch – leading in diesel technology and workshop test engineering Bosch has been the world's leading supplier of diesel technology since the production of the first diesel truck in 1924 and the first diesel car in 1936. As a result of regular close collaboration with engine designers and the innovative energy in development and production, modern high-pressure systems, whose high performance and economy have resulted in an increased market share for diesel systems, have been built in recent years. Using the expertise gained from the original equipment, innovative testers, incl. the corresponding ESI[tronic] software, have been developed in parallel to this. They enable the diagnosis of these electronically controlled diesel systems on the vehicle, in order to then selectively exchange defective components. As a result, Bosch makes it possible for every workshop to master modern diesel technology and fulfil sales potentials. |
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