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In diesel engines in particular, EGR systems come with serious drawbacks, one of which is a reduction in engine longevity. For example, because the EGR system routes exhaust gas directly back into the cylinder intake without any form of filtration, this exhaust gas contains carbon particulates. And, because these tiny particles are abrasive ...
Balancing the percentage of cooled external EGR with the hot internal EGR generated by a VVA system, makes it possible to control the in-cylinder temperature. While electro-hydraulic and camless VVA systems offer control over the valve event, the componentry for such systems is currently complicated and expensive.
Volvo D5 engine D5244T15 (), in 2015 model year Volvo XC70It is an all-aluminium five-cylinder engine with 20 valves and double overhead camshafts.In all but one late version it has a VGT turbocharger of the type VNT (variable nozzle turbine), common rail direct injection and cooled exhaust gas recirculation (EGR).
The L56 is emissions controlled with EGR and catalytic converters. The L65 engine has neither an EGR system nor a catalytic converter, but there is a soot trap on L65 engines that is often mistaken for a catalytic converter. GM was the first manufacturer to introduce an electronically-controlled fuel injection system into a diesel pickup truck. [2]
In addition to changing the fuel, US engineers have also come up with two other principles and distinct systems to all on-market products that meet the U.S. 2010 emissions criteria, [citation needed] [needs update] selective non-catalytic reduction (SNCR), and exhaust gas recirculation (EGR). Both are in the exhaust system of diesel engines ...
The block designation was changed to J to reflect the changes to the new engine, which included power assembly and block redesigns, as well as the addition of a two-stage turbocharging system consisting of three turbochargers. [12] Other new features are an EGR system to reduce exhaust emissions and double-walled fuel injection to increase safety.
The changes included the addition of an exhaust gas recirculation (EGR) system, and a variable geometry turbocharger system to improve torque. In September 2004, Detroit Diesel ceased production of the Series 50 heavy duty diesel engine for on highway applications due to emissions standards. It is still available for off-road applications.
Volvo FM VGT diesel engine with EGR emissions technology. Variable-geometry turbochargers (VGTs), occasionally known as variable-nozzle turbochargers (VNTs), are a type of turbochargers, usually designed to allow the effective aspect ratio (A/R ratio) of the turbocharger to be altered as conditions change. This is done with the use of ...